If you mailed in a regular Return we ask that you allow up to 21 days for the Irs to process your Return.
You can go to Irs.gov to check the Status
https://ttlc.intuit.com/replies/3319882
If you have filed a Amended or "Corrected Return this can take longer
All amended tax returns must be filed by mail. If you have already
mailed your amended return, it can take up to 3 weeks to show up in the
IRS system.
You can check the status of your amended return by clicking the link below:
I hope this answers your questions!