Magical Express is set to start on May 5 - so if you are traveling after then, you should be ok from MCO to your resort.
I'm going to take a guess here - Do NOT put the Wonders luggage tags on your bags before you leave home - because you want the luggage to get to your resort - so you will need to pick them up in baggage claim at MCO yourself. Once you arrive at your resort you can tag your bags and on your last night on land, you put the luggage outside your room and they take it to the ship for you. Anyone that's actually done this - please verify