You can check the status of your amended return here but allow 3 weeks (**normally but see note***) after filing for it to show up:
https://www.irs.gov/filing/wheres-my-amended-return
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Amended returns can take up to 16 weeks (4 months) to process in normal times but due the the Corona virus shutdown the IRS is not even opening mailed returns at this time and just storing them so the 16 weeks will not even start until the IRS returns to normal - whenever that will be - and there will be a huge backup of mail.
https://www.irs.gov/newsroom/irs-operations-during-covid-19-mission-critical-functions-continue
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