I cannot tell if i paid. It informed me during payment that it would not post for 2 days and i may therefore get a late fee. Would not let me go back How do you know?

You can find your direct debit information on the Federal Information Worksheet.  To get there, do this:

Log in and from the left navigation bar go to Taxes Home then Tax tools>Print center>Print, save or preview this year's return>2018 Federal return and Include government and TurboTax worksheets (optional)>View or print forms.
Look for the Federal Information Worksheet. It is in Part V.

You might also find this information on the first page, the Filing Instructions, at the top of the page.