Amended returns typically take about 4 months to process after you mail them. If mailed at the end of July, you should probably receive it in November-December.
It is suggested that it be mailed certified with return receipt (or other tracking service) to verify that the IRS receives it - you can check the status here but allow 3 weeks after mailing.
https://www.irs.gov/filing/wheres-my-amended-return
I already filed my amended return and irs got it , makes an adjustment in 07/05/2019 and they just completed it 07/26/2019 .. JUST TRYING TO FIGURE OUT DO THEY MAIL YOUR CHECK THE SAME DAY THEY COMPLETE IT OR HOW DOES IT NORMAL WORKS !
Check the https://www.irs.gov/filing/wheres-my-amended-return website.
Only the IRS could tell you that, but allow 2-3 weeks before calling them.