Mine have routinely come in the regular mail, about 4 weeks before we are due to depart. I know some have gotten their packets via FedEx but that was usually a rush situation, not the norm.
If I'm assuming correctly, you're due to leave soon and have yet to get your DME info packet. I would call whomever you booked your resort stay with, and make sure they have you down for DME....just to be on the safe side. If you do not get your DME stuff before you leave, you can still go to the checkin counter at MCO, and they will print up vouchers for you. You can either get your own, untagged, luggage at baggage claim and then bring them to the bus with you, to be stowed underneath your bus, or you can give the baggage receipts to the DME checkin people, with a description of the bags, and they will get them for you and transport them to your resort on the luggage truck.
But first, double check to see if they have you down for DME service.