Unfortunately, because the IRS has not updated, TurboTax cannot update. The only thing to do right now is wait.
If you file the return as is, the IRS will automatically recalculate the Premium Tax Credit. However, that will cause a processing delay.
Resources to check for updates:
IRS: Premium Tax Credit: Claiming the Credit and Reconciling Advance Credit Payments
TurboTax: How will the third stimulus impact me?
@jmaggio
@ddrfill
