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In theory, you should have a finalized divorce decree on March 11th, unless the opposing party contests the proposed decree on the basis that it's not the same as the MSA.
Whether or not you'll also have the POA and SWD signed will depend on what your lawyer asked for in the Motion to Sign and/or the language in the divorce decree. Usually if these documents are part of the agreement, there's a deadline in place in the divorce decree for signing and returning them. So I'd take a look at the proposed decree and the Motion to Sign and see what they say. If they're silent on the issue, I'd remind your lawyer and see if they can ask the Judge to order the opposing party to sign both by a date certain.
It would depend on the adjustment needed. If it's just crossing out a word here and there, the parties can usually just initial minor changes. If it's big changes, unless your lawyer has a laptop and printer at their disposal at court, it's unlikely that the changes will be made that day.
Probably no more court fees would be required, but you'd have to follow whatever agreement you and your lawyer had in terms of payment for further work.
Your attorney could probably ask the Judge to order a new deadline. That's a minor change in the decree that could be made the day of. If your courthouse has a notary, it would also be simple for all parties to just sign on the 11th in front of the notary at the courthouse.