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If mother is the executor, then it would be up to her to file a probate case in the local Surrogate Court where uncle lived. You wouldn't have legal standing to do so on mother's behalf.
So assuming mother files the probate case, she would get the petition to open probate from the Surrogate Court clerk and then complete it and file it. Once she filed it, there would be a hearing date where she would be appointed the executor formally and then could take possession of any of the deceased's assets, including any bank accounts. Mother as executor would then use those assets to pay any funeral expenses and any debts of uncle. Once she paid all the debts of the estate, she would be able to distribute the surplus assets to herself as the sole beneficiary and file a formal accounting and petition to close the probate case with the court.
But until she is appointed executor by the judge, she won't have the power to access his bank accounts because the POA expired upon his death.