How can I check an amended file?

[RayW7]

To check the status of the federal amended tax return, Form 1040X, that you mailed to the IRS, use this website - https://www.irs.gov/filing/wheres-my-amended-return

[SweetieJean]

Also see:

Amended Return Frequently Asked Questions | Internal Revenue Service (irs.gov)

and note this:

Will filing my Amended Return be processed faster when filed electronically?

Currently, the normal processing time of up to 16 weeks also applies to electronically filed Amended Returns.

ibid.