Welcome to OFF.
Stocked trout acclimate quite quickly; usually within a day or two. Then they begin to revert to their natural instincts and act like wild / native trout. At least that is what the author of "Taking Stockers" says, in a recent edition of Outdoor Life.
During the first couple of days bait (power bait/eggs, worms, etc), spinners and spoons usually work well. But, after that they'll switch to more natural "bait" like flies, terrestrials, underwater critters and the like.
In regards to actual time of each stocking, your guess is as good as anyone else's. Trillium is "advertised" in the stocking schedule for the "week of" the 30th. So, the stocking can take place anytime during that week. The actual day, is dependent upon the ODFW hatchery employees. It can happen on Monday. It can happen that Friday. Or it can happen on any day in between.
Good luck and hope you have fun, if you head up there. You'll be fishing side by side w/ some very nice OFF members, and I'm sure that they'll be willing to help you.