In order to use RAC, you must be done and walking away, boarding passes in hand, no less than 3 hrs prior to flight time. This is why you really can't use RAC if you have a flight before 8:30am.
For an 8am flight you would most likely be given a p/u time of between 4:45 and 5:15...depends on where your particular resort falls along the route. Be sure to be out at the bus stop, ready to go, 10-15 mins prior to your time...that time is the time the bus is supposed to leave the resort, not the time you should get to the stop.
As far as baggage arriving in your room...figure on up to 3 hrs after resort check in, and the room is ready. You can arrive and check in at 9am, but you can't be looking for checked bags to arrive by noon if you don't have a readied room yet!!!