I filed my 2020 federal taxes with turbotax last April, 2021, on time. How do I now file my now late 2020 STATE taxes with turbotax?

[VolvoGirl]

Is it done and you just need to file it?  You can print it out and mail it to the state.  Otherwise you have to switch to the Desktop program to finish.

How to finish a return you started online,

https://ttlc.intuit.com/community/prior-year-return/help/how-do-i-finish-a-prior-year-return-that-i-...

[mesquitebean]

Did you use a paid edition for the 2020 Federal return?   If so, and if you already paid for the state return last year when you paid for the Federal return, TurboTax Support "should" furnish you the 2020 desktop software.