It is frustrating not knowing if the IRS received your return. Due to COVID-19, the IRS expects delays for paper returns. Usually, the IRS says to allow 4 weeks before checking the status of your refund and that refund processing can take 6 to 8 weeks from the date the IRS receives your return.
With all the programming changes due to the American Rescue Plan Act, I would expect closer to a 6-7 week window to start checking for your refund status. If you mailed your on 2/16, lets assume the IRS received it on 2/20. 6 weeks would put it at around the 1st week of April before processing would begin. I would start checking "Where's my Refund" the 1st or 2nd week of April.
