Dusk--if you need a great answer "within hours" I hope this gets to you in time---but honestly your best bet might be, if possible, to just blow off using the resilient channel. As previous posts have suggested, this is not the best way to add significant sound isolation. We do a lot of "commercial" acoustic consulting, and we see resilient channel installed incorrectly more often than not, specified by some architect or contractor who doesn't know better.
The discussion of actually implementing a true "floated" wall/ceiling system is lengthy, and also covered in earlier posts. But I'd say, at this point of no return in your construction, ditch the resilient channel and see if they can apply the cost to adding another or two of drywall---mass is your only real friend at this point.
The use of caulk at floors and edges and piece joins is to ensure the assembly is air tight--this is not a place where physical de-coupling happens. You also don't need "acoustic" (non-hardening) caulk here cause you are not trying to "float" --you are need to seal. Non-hardening caulk has its use in other places. If you forgo the resilient, bring all the drywall as close as possible to the floor and edges, don't hold off 1/4"---and then caulk the small seam that is left.
Good luck! Happy Christmas if you can rest easy!