I've done this a few times. They've typically told me it would be 3pm before my luggage was available at my new resort, but I've had mixed experience with that. Once it was available at 1pm, so I felt lucky; but on another trip it was 5pm before it arrived. I guess my advice is to not make any hard assumptions other than it should be available by early evening.
Also, you do have to call or stop by bell services to request your luggage be delivered and be in your room to have it delivered (unfortunately, this is not like DME where it magically shows up... a lesson I learned the hard way at 1 am the first time I had luggage transferred).