The No.1 stopper now is Congress possibly not deciding during the old term anymore and having removed MAX extension votes on several occasions. Stopper No. 2 is the FAA needing and taking all its time and moving forward only step by step after each requirement has been demonstrated to have been implemented. Stopper No. 3 is EASA that had own firm requirements for modifications needed like the third sensor that were linked to the promised old deadline.
It looks like this might take a little longer? Didn't Boeing mention mid 2024?