The IRS was not processing any paper tax returns for several months due to the pandemic and limited staffing. They have only just recently started to process the approximately 11 million paper tax returns as they were 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.
If you are receiving a federal tax refund then use the IRS tax refund website for the status - https://www.irs.gov/refunds