The IRS website doesn't allow you to pay on April 17th (a Sunday) or any other weekends. Turbotax let me schedule my payment date on April 17th. Will that be on time?

The filing deadline to submit 2021 tax returns or an extension to file and pay tax owed is Monday, April 18, 2022.

Your Sunday payment will still make the deadline.

Also, see:  April 18 tax filing deadline