To access your current or prior year 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)

See this TurboTax support FAQ for accessing prior year online tax returns -

https://ttlc.intuit.com/community/prior-year-return/help/how-do-i-access-my-prior-year-return/01/270...

Doesn't help.

You can save your return as both a PDF file and a .tax file (i.e. .tax2019) to your computer and then transfer the downloads to your flash drive. Please see the below links for saving as each document type mentioned:

How do I save my 2019 TurboTax Online return as a PDF?

How do I save my TurboTax Online return as a tax data file?