An omnipotent God could not have freewill.
What is your definition of “free will?”
Merriam-Webster defines “free will” as ” voluntary choice or decision” and “ freedom of humans to make choices that are not determined by prior causes or by divine intervention.”
There is a problem in trying to define something that does not exist.
For God to have free will there would have to be such a thing as choice.
An omnipotent God would know all choices He would make in the future.
If God knows beforehand which choice He would make, there would be no reason to make it.