Where can I find in TurboTax the date that I scheduled the ACH payment of state taxes (specifically for Delaware)?

The bank information and the date you selected to have the state taxes owed paid will be on the State Filing Instructions page.

To access your current or prior year online tax returns sign onto the TurboTax website with the User ID you used to create the account - https://myturbotax.intuit.com/

When you sign onto your online account and land on the Tax Home web page, scroll down and click on Add a state. 

This will take you back to the 2022 online tax return.

Click on Tax Tools on the left side of the online program screen.  Then click on Print Center.  Then click on Print, save or preview this year's return.