The IRS has not processed paper filed tax returns for several months due to the pandemic. They have only just started processing those tax returns in the order received.
Go to this IRS website for information - https://www.irs.gov/newsroom/irs-operations-during-covid-19-mission-critical-functions-continue
We’re experiencing delays in processing paper tax returns due to limited staffing. If you already filed a paper return, we will process it in the order we received it.
Do not file a second tax return or contact the IRS about the status of your return.
So you mailed it? Sorry the IRS has limited staff due to Covid-19. They just started opening the mail in June that's been stacking up. So you have to keep waiting.
See this IRS page for the latest information
IRS commissioner Chuck Rettig recently stated that all 511 IRS facilities were closed due to Covid or put on reduced staffing for more than 3 months and in that time more than 10 million envelopes piled up in trucks and this will take some time to catch up in processing all this mail... patience will be needed.
The IRS has received 134 million returns so far and have processed more than 96 million refunds ... quite a task during a normal tax period let alone during a pandemic ... and they also were tasked with implementing a stimulus package distribution ... a daunting task in the best of times.