So you prepared a Form 1040X, Amended Return? And hopefully, you printed, signed, and mailed it. An amended return cannot be efiled.
Approximately 3 weeks after mailing, you should be able to start tracking it at this IRS site:
https://www.irs.gov/filing/individuals/amended-returns-form-1040-x/wheres-my-amended-return-1
It can take the IRS up to 16 weeks to process an amended return.