Efiling the 2019 amended returns thru TT was supposed to happen by the end of the week so it may be possible that you actually got the amended efiled ... you may be the first ... so it is unknown how the system will work ... normally when you efile you get 2 emails ... one for the transmission and the other for the acceptance or rejection.
Your return's electronic filing status history records all e-filing activity related to the return, including the Electronic Postmark. You can print it out if needed.
TurboTax Online
https://shop.turbotax.intuit.com/efile/efile_status_lookup.jsp -- enter the Social Security number of the first taxpayer on the return and the ZIP code to retrieve your filing status history.
TurboTax CD/Download software
(Windows) From the TurboTax File menu, select Electronic Filing > Show Electronic Filing Status History.
(Mac) From the TurboTax File menu, select Check E-Filing Status.
