Desktop (CD/download) software for 2020 is available through the TurboTax site and from various retailers such as Amazon, Walmart, Sam's, Costco, etc.
https://turbotax.intuit.com/personal-taxes/cd-download/
Online TurboTax for 2020 will not open until early December.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**