If you get there early enough (on a regular 9am opening day before 8:30 or so) you should be parked in Aladdin (which is the closest MK parking.) At that time the trams aren't running yet, but from Aladdin it is a short walk to the TTC center. From there, the monorails won't be busy, so as long as they are up and running and all of that, it should only take 10 mins max to get on the monorail and ride over to MK. After getting off the monorail (again, if you are early enough) it should only take a few minutes to get through security.
Just remember at that time of morning, 10 minutes can make a HUGE difference with the amount of people packing the monorails and getting through security and what not, so the earlier you get there, the easier it will be.