When did you mail it? You know amended returns can only be mailed, right?
In normal times it takes up to 16 weeks or more to process an Amended 1040X return. But these are not normal times. They just started opening the mail in June that's been stacking up. So you have to keep waiting.
See this IRS page for the latest information
Then once they start opening the mail, After 3 weeks you can track it here,
I did send ammendment document by usps mail around mid of april and i was checking the status from the link you provided it could not find any details with my details.
not sure where is my return for the amendment . The main reason i file is i miss the stimulation check due to the eong ssn for my wife . It was using itin in the original 2019 tax filing .