Lacerte says this as of now  502LU Final form without watermark was released on April 16, 2021 ( I don't have Lacerte so can't confirm it is active, but it sure looks like it is)

MD's press release from 4/15 says the following, sure doesn't sound like they feel they have more work to do on the forms.

ANNAPOLIS, Md. (April 15, 2021) - Comptroller Peter Franchot announced today that all individual Tax Year 2020 tax forms have been updated and are ready for use by taxpayers and tax preparers, effective immediately.

MD is making changes still to Form 511, but to my knowledge the 502LU is completed and there are no further changes pending on there, most software companies have been updated and for Intuit to not have any clue when it may or may not be available is inexcusable in my opinion.