If your flight arrives at 6, you should be at the resort by 7:30, at the latest. Your bags could arrive anytime from then until midnight. I imagine you are concerned about the possibility of being awoken after 10, by baggage delivery to the room. If you are planning on being in bed by 10, then I would ask bell services to not deliver the bags until the morning. But, I have heard others comlain that bell services still delivered their bags even though they were asked not to.
So....since you aren't in a huge hurry to get to the resort, I would plan on getting the bags yourself. It will add about 20 minutes to the time spent getting to the resort, but you can go to sleep knowing no one will be knocking at your door at midnight!!! Just don't put the yellow tags on the bags when you leave home.