PEG tube transition to solid food. How long and what are the steps to eliminating the PEG tube feeding?

My father-in-law had a PEG tube inserted after emergency brain surgery and being sedated for a few weeks for healing.

He has been in a rehab center and is physically capable of walking and taking care of himself. The last step is to return to oral feeding.

A month ago, he passed his swallow test and the dietitian introduced puréed food and supplemented it with his PEG feeding.

Now after 1 month, they are starting to introduce a larger size to the puréed food, but we have never been told the overall steps to getting him to exclusively oral food intake.

We realize that the time for each stage is not set in stone, but they will not even tell us the steps.

My internet research has told me a few things, but I do not take that as fact.

Does anyone know the steps used to transition to 100% oral feeding and the removal of the PEG tube?

Thank you all very much.