In Vancouver debarkation is called by character groups on the luggage tags...if you have a flight before noon, you will be in the first group (Mickey or whatever).
That being said, it is probably still a better bet to carry it off yourself. Barring some strange delay in docking the ship, if you do that I don't think you'll have a problem getting to the airport on time.
Remember, however, that if you are flying back to the US from Vancouver you will have to go through US customs in the Canadian airport, which can be lengthy.