Assuming you printed, signed, dated, and mailed the return to the correct IRS address, it takes about 6 weeks for the IRS to process a mailed return and send a refund, if it does not require further examination. There's no way to know how the COVID-19 situation will cause any delay in processing due to any personnel shortages.
About 4 weeks after mailing, it should show up in the IRS "Where's My Refund" tool, where you can monitor and track your refund. There's no need to try it before then, since it likely will not find you before the 4 weeks.
https://www.irs.gov/Refunds
At that time, when using the IRS WMR tool, be sure you enter the correct SSN and filing status.
Use only the Federal refund amount. Do not use any combined total refund figure that includes the state refund.
Look at your actual 2019 return to get the Federal refund amount. Be sure you are using what is displayed on your Federal Form 1040, Line 21a for the Federal refund amount.
