Well ... you did hear of the IRS covid shut down earlier this year ...
They just started processing mailed returns that have been stacking up. See this IRS page for the latest information
https://www.irs.gov/newsroom/irs-operations-during-covid-19-mission-critical-functions-continue
Expect mailed in returns to take 5 to 7 months to process this year. Check the IRS site once a week until you see your return is processing and then once a week until you see the refund has been approved and a date it is issued ... https://www.irs.gov/refunds
