How do I ensure my tax filing is processed? I mailed my forms and made a payment online (no refund)

Basically as titled, I mailed in the forms because I want to file a form that TurboTax does not support. I do owe taxes so I used IRS direct pay. The payment was processed but how do I know if my tax filing is processed. The tools for checking the status of refunds do not work for me because I had no refund. How do I ensure my tax filing is processed?

 

I have the same problem with California too.