2024 Amended Tax Return Question

I filed my 2024 TurboTax return electronically on March 5.  That return showed a refund of $26,800.  The next day I realized that I had forgotten to add my wife's 1099-G of $9,809.  I amended the return, so TurboTax now shows that I owe $1,172, because, I assume,  TurboTax assumes that I have been refunded the $26,800 and now owe the IRS $1,172 due to overpayment.  During the filing of the amended return, I scheduled the overpayment to be drafted from my bank account on 4/15, with the assumption I would have received my refund prior to that.  My question is this: If I have not actually received my refund by 4/15, do I really owe the IRS anything on that date?  Seems to me that I'm only obligated to pay back overages I actually receive, and I have not received anything to-date.