TurboTax online and e-file for 2019 ended on Oct 15, 2020. 2019 (and earlier tax years) can now only be completed using the CD/download software installed on a Mac or Windows computer. The return must be printed, signed and mailed.
2017-2019 software can be purchased here:
https://turbotax.intuit.com/personal-taxes/past-years-products/
Suggest that you read IRS Pub 559 (Survivors, Executors, and Administrators) for a lot of good information about filing the final return and estate return and other requirements.
https://www.irs.gov/pub/irs-pdf/p559.pdf
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
