@Jkmoore357
Your TurboTax account will never know if your mailed return was received by the IRS or not. And unless you mailed by a method that has tracking, such as certified mail, priority mail, etc., the only way to know if the IRS received it is when it appears in their WMR tracking tool or refund hotline (or if they cashed a check that was enclosed.)
I assume you printed, signed, dated, and mailed the return to the IRS. TurboTax does not mail it for you. We have seen people sometime mistakenly mail both the Federal and state returns only to the state tax agency and nothing to the IRS, so hopefully you correctly mailed it to the IRS.
That being said, 4 weeks after mailing, it should have started appearing in the IRS "Where's My Refund" tool.
https://www.irs.gov/Refunds
If you are finding no information there, then here are some tips:
When using the IRS WMR tool, be sure you enter the correct SSN and filing status.
Use only the Federal refund amount. Do not use any combined total refund figure that includes a state refund.
Look at your actual 2019 return to get the Federal refund amount. Be sure you are using what is displayed on your Federal Form 1040, Line 21a for the Federal refund amount.
You can also try phoning the automated IRS refund hotline. I've seen it work for some users before when the WMR tool didn't.
800-829-1954
