TurboTax cannot mail or email your tax return to you. You can download a PDF of your tax return yourself. The latest tax year that could have been filed is for 2017. Tax year 2018 does not end until after 12/31/2018.
To access your current or prior year tax returns sign onto the TurboTax website with the User ID 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)
You can also get free transcripts of your federal return from the IRS - http://www.irs.gov/Individuals/Get-Transcript