Now that's a lot of questions! Settle down, because those 77 positions are for CTs AND new recruits. They will *probably* run approx 6 courses of 12 over the year in Borden, and they will stagger them through the year. Now here's the part that makes life hard: Usually they will course load a serial of applicants for an occupation on the same BMQ course; at least they used to anyways. And they will time it so that they do the BMQ course that ends reasonably close to the start date for their QL3 course. That shouldn't apply to you as you *should* get a BMQ bypass as you're in the PRes, probably did BMQ fairly recently, right?
With all that being said, I would speculate that an offer would be held back until fairly shortly before the course you are to be loaded on, *if* you are selected. So you could still be in for a wait, but that is all speculation.
Facts: 77 positions were forcasted, courses run through the year, and you will be competing against civilians for those positions.