Where can I find volunteers or resources to hire companion help for my husband with Alzheimer's with a little bit of Respite care money too?

Check with memory care units for respite resources. Your husband may need to be tested for COVID before he can be accepted.

You can also check with home health agencies for caregivers to rotate coming to care for him, but I would lean in the direction of a memory care unit respite.

A few questions for you.
Is your husband a Veteran? If so the VA can help with providing some caregivers.
Would your husband be eligible for Hospice? If so Medicare will cover some Respite.
You can private pay for Respite. And if you like many places that have Memory Care also have rehab on the same property it might be possible that you could be with him. Or if you choose to rehab at home you can hire caregivers that can come in.
Your local Agency on Aging might also help. They may have resources that might provide help.

It might help if you indicate where you live.

What state are you in?

If you have an extra room in your home you could advertise for a companion. These arrangements trade rent for companionship, and can be short term. Depending on the needs you each have a bit of money can be tossed in too, but free rent is quite valuable.
Best of luck to you both.

Do check with your insurance to see if they might provide (although you might need help with unpackaging...heavier with dry ice) home delivered frozen meals. I have a friend who is getting those due to husbands hospitalization from Mom's Meals and she says they are quite good.
Check in with your local Area Agency on Aging or Alzheimer's Assn...they often know of respite programs. or other resources.
Meals on Wheels, yes probably available but sadly in our area they are not appetizing and you need good nutritious food to help heal.
It's SO hard for us to look out for our own well being and yet it is essential if we are going to survive and be able to continue caregiving. Split the needs apart...Use other home delivery and grocery delivery services, a driver for your husband who can also be a companion for the duration.
How about if it is medical appts for the recovery period that you link up with a home visiting MD? In our area both competing medical systems offer that. Perhaps the social worker at the hospital you'll be at has some ideas?

You most likely will not find a volunteer for this.

You can get meals on wheels for food, you can hire someone to come in during his most needy hours and you can hire a housekeeper to come in weekly, biweekly, whatever you need. I think it would be cheaper to find a facility and pay them for 2 months respite.

You can stock your freezer with homemade frozen meals, that would ensure that you are able to eat with minimal effort.

Do you have a church family? This is where you can ask for free help. Most are willing to step in for a short time of need and many hands lesson the load.

Ask your doctor about in home services, for both of you. It would require a prescription for you and him separately, because aides do not provide services for anyone but their patient.

Best of luck with your surgery and findings respite care for your husband.

https://www.agingcare.com/questions/how-do-you-get-outside-help-when-my-husband-with-alzheimers-refuses-to-do-anything-with-anyone-462205.htm

In this post you say you are getting money for respite care. How were you able to get that?

As said, call your County Office of Aging to see if they can help.

Unless you get a younger, trusted relative to come and stay with you, you will need to engage an in-home caregiving agency. They will provide as many properly qualified aids as needed. Not sure exactly where you live but the hourly rate will be at least $20 p/hr depending on their training level and labor shortage issues. An agency does the background checks, provides subs and takes care of all the employment/labor law issues that you'd be needing to do if you attempted to hire people on your own and then tried to manage it all while in the midst of recovery, pain, rehab, etc.

Or, do you have the option of having him go to an adult day care center during the day? Sometimes churches have adult day care programs that are low-cost or free.

Please contact your local area's Agency on Aging as they are a wealth of information on resources for your situation. You may need to contact social services, but your husband would probably have to financially qualify for services.

Also, I strongly recommend that you have a very trusted person come to administer your prescription pain meds, as many people just like yourself have inadvertently become addicted because it's so easy. I mean this sincerely. My sweet little old MIL became addicted before our eyes after back surgery. It took us a while to figure it out since she didn't fit our "profile" of an addict and it caused a lot of problems for her and us.

I hope you can get what you need and have a full recovery!