To be honest, I think the spots for the temporary workers will go extremely quickly, probably done in a few days. The students on the other hand, probably will be done within a month or two is my opinion for the following reasons:
1) Some students have left Canada during COVID without graduating, and it would be difficult to return here in order to work due to having to apply for a work permit or student visa again(working is a requirement for this pathway stream),
2) Lots of students likely are a bit late on booking the English tests. Even those who graduated a few years ago also have to do the same thing, so I imagine the English test will be the #1 bottleneck for those trying to get in.
3) Students need to be employed (some are out of work). Will they also know that they need an employment letter, NOA, T4s, paystubs as well?
4) The applications will likely require a police certificate, translated and all. If students don't try to get one ahead of time, they may be behind others who have already got theirs.
5) The applications will most certainly require a medical exam, some clinics are currently booked solid.
My personal opinion is if your test is booked in May, you're almost certainly guaranteed a spot. June is so-so. July and beyond you're likely out of luck