You can use TurboTax to complete and e-file a 2019 tax return up through October 15, 2020. After that date the 2019 tax return can only be printed and mailed and you will need to use the desktop editions. The 2019 online editions will shut down shortly after 10/15/2020 to make way for the 2020 online editions.
The 2019 TurboTax online editions - https://turbotax.intuit.com/personal-taxes/online/
The 2019 TurboTax desktop CD/Download editions - https://turbotax.intuit.com/personal-taxes/cd-download/