IRS Account Status - Your 2021 Tax Return Is Not Processed

When I log in to my IRS account to check on my refund, I receive a confusing status.  I think what it is saying is that my return (that I filed by mail) is received but not processed.  My concern is that I might be wrong and they might have never received it.

Account Status

Your 2021 Tax Return Is Not Processed

The due date has passed. If you've already filed, processing usually takes 21 days (electronic returns) or six weeks (paper returns).If you still need to file, submit your tax return along with any payment due as soon as possible to minimize potential penalties and interest. If you’ve been affected by a recent disaster, learn about the most recent tax relief provisions to know your options.