Why is turbo tax saying I have maxed out my $10,000 salt deduction for 2020? Hasn't the deduction max been increased to $20,000?

No.

gotcha.  proposed in a relief bill but never approved, right?

Yep ... lots of talk and no results... yet.

thank you

IF the SALT deduction is restored, as is insisted on by certain congressmembers, it will help you with your 2021 tax return.

are you also willing to have your standard deduction put back to one half what it is now?