After you file


@Carbcycle wrote:

I need to change my bank information for future stimulus payments 


There are only three stimulus payments.  There are no more stimulus payments being planned.

The bank information you entered on the 2020 federal tax return is the information that will be used by the IRS.  It can only be changed when you file your 2021 tax return next year if you are receiving a tax refund or have taxes owed.