For tax year 2018 use the TurboTax website for the date the federal tax return was accepted by the IRS - https://turbotax.intuit.com/tax-tools/efile-status-lookup/
For both tax year 2017 and 2018 there are Postmark Reports included with the PDF which show the date/time the federal tax return was transmitted and the date it was accepted by the IRS. For 2018 use Print Center.
Assuming the you have either paid the TurboTax online account fees with a credit card or have filed the 2018 federal tax return and it has been accepted by the IRS -
To access your current or 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)
Or -
When you sign onto your online account and land on the Tax Home web page, scroll down and click on Add a state.
This will take you back to the 2018 online tax return.
Click on Tax Tools on the left side of the online program screen. Then click on Print Center. Then click on Print, save or preview this year's return. Choose the option Include government and TurboTax worksheets