Mom is currently ill in the hospital after a heart attack and also has COPD prognosis, not good. She has been in a delirium state. Advice?

I’m sorry you’re going through this and hope you have engaged hospice for the help they provide. My dad knew without a doubt that his life was ending. He often talked about it and I’d simply say “I understand” Your mom will pass exactly when she’s supposed to, despite any predictions or hopes. It’s the natural course of life and I wish you both peace

It sounds as though she may have an inkling that she may, indeed, be dying. Has she ever discussed hospice, end of life wishes with you? If she doesn't stay on the subject she may well be afraid to hear you say "You are right; do you have any last wishes"! Many people who are afraid to die act in just this exact manner. Bring it up as a kind of drive-by hoping for reassurance.
If, like you, you Mom is a person of faith you can kind of smile as though the thought never occurred to you and say "Only God knows that Mom, for either of us, but are you uncomfortable? Is there something I can tell the doctor about what you are feeling? Is there a reason you feel this way? Is there something I can do, or something you want to tell me? I know you are not feeling well. " If she responds to you that she is afraid, reassure her with what the two of you believe about faith.
Be guided by what SHE wants to speak of. Don't give her any of this "go toward the light" stuff at the end. My fellow nurse friend said this to her brother at the end and he looked at her with horror, like "what-the-heck! Am I DYING!!" I as a nurse have come to see this as a no-no. Let the person tell you what they feel, what they experience, what their hopes and fears are.
Something I often saw toward the end was people seeing friends and family who passed some time ago. They often began to feel happy/relieved at that point.

I think oftentimes the soul knows when its getting ready to transition. Your dear mom may be feeling that herself now, with her health declining as it is. It's probably a good idea to tell her it's all in God's hands, but that you're right next to her and holding her hand for support. When my dad was approaching the end of his life, I climbed in bed with him and put my head on his shoulder. I told him how much I loved him and what an admirable life he'd led. How he'd touched a lot of lives with his kindness, which was the most important thing a person could accomplish in life.

Is hospice involved at this time? That may be prudent to consider if not, as they can be very supportive to both you and your mom now.

Wishing you the best of luck with a difficult situation. Sending you a hug and a prayer for courage and strength.