How could i know i have efiled my tax? The front page said : way to go, you filed your 2019 taxes.

You complete your tax return by finishing all 3 Steps in the File section. In Step 3, to e-file your tax return, you must click on the large Orange button labeled "Transmit my returns now".

After completing the File section and e-filing your tax return you will receive two emails from TurboTax. The first email when your tax return was transmitted and the second email when the tax return has either been accepted or rejected.

The status of each tax return, Federal and State, will be shown at the top of the screen for each tax return.

If the status is Accepted then the tax return was e-filed and accepted by either the IRS or the State.