You don't have an answer because we don't have an answer. Something like this is not an automatic process. There has to be negotiations between the bank and the IRS. If an agreement is reached that they will cooperate in having this be an option, it still has to be programmed. It is not the same as getting your refund.
We are still waiting for IRS guidance regarding updating or providing direct deposit information for the stimulus payments and how they will be distributed to these type of accounts. We will have more information once the government finalizes the details.
In the meantime, you can visit the following links for the most recent updates:
IRS Coronavirus Tax Relief
TurboTax Corona Virus Tax Center Updates
IRS Stimulus