If you e-filed your 2018 state tax return and it was accepted by the state, there will be a State Postmark Report that will have the date/time the state tax return was e-filed and the date it was accepted by the state in the PDF download.
To access your prior year online tax returns sign onto the TurboTax website with the userID you used to create the account - https://myturbotax.intuit.com/
Scroll down to the bottom of the screen and on the section Your tax returns & documents click on Show. Click on the Year and Click on Download/print return (PDF)
