Correct me if I am wrong here, but I think you would have to take it yourself. Generally, your luggage arrives on a different form of transportaion, like a van or a truck, and unloads at a different part of the resort, where it is sorted and then delivered to your room. There may be a possibility of putting your yellow tags on the bags when you get to the resort, but then you would have to find the ME area of your resort, and see if someone would take them from you there to put your bags into their holding spot. I'm not sure if they would do that.
However, why don't you just take your bags with you into the resort and if your room isn't ready, have bell services hold them and deliver them when your room is ready? Sure, you'll be tipping the driver of the bus and bell services too, so it will cost you a little more, but in the long run, I think it would be most convenient for the service you are looking for.
On a personal note, we used ME in Sept., and after checking in, headed to the parks, came back that night, and there were our bags. Perfect!