Most facilities and systems do not release on Sunday.  We'd recommend calling their staff secretary to find out whether Sunday release is something they do.

The sentence range sounds like a state charge (not federal). If that is correct, then he will have some early release options that could have him out as soon as 18 months on parole/probation if he keeps his record clean while in there. If he gets incident reports and has issues with authority, he could do the whole three years.

Weekend release dates on that fall on Sunday might get an inmate out a day sooner if the facility does not do weekend releases 

call the facility or ask your husband... if he doesn't know his own out date, no one does

He should have the same release date. We do not know what class this is or how it's completion might affect the actual release date, they normally would not interfere.

FL DOC offers transportation either with a bus ticket or some arrangement to get them to their freedom destination

He definitely knows - the ONE thing for sure is that an inmate knows the exact date they re to be released, there is nothing more important to an inmate than the day they are leaving. If the release date is "unknown", that means there are other forces in the way like potential new/old charges pending which keeps their release in question.

It depends on his charges - the length of the sentence seems pretty short and we doubt it will give him any relief because of it. Prop 57 changes the State Constitution sentencing and court procedures for two kinds of situations. Adults convicted of non-violent felonies would be eligible for parole after serving time for their main crimes. Inmates may also have more opportunities to reduce their sentences through credits for good behavior and approved educational activities.

Most of the times, a "hold" from another jurisdiction is known ahead of time and the inmate's coun selor will go over the new charges and why they are getting referred to the new venue. There are however instances where the hold comes up at the last second but that is rare. 

No. Parole is an option that is determined at sentencing by the judge. If parole is available to you, you would likely get a chance to reduce your time served and not have to do the entire bid inside. Not all offenders are given parole as an option in their Judgement and Commitment order. If you don't have that option you will do 85% of your sentence and then get released. You will immediately report to the Probation Office and