Hiya, Brandon! Welcome!
I just want to applaud your boss for the awesome surprise! Now that's someone who would be great to work with.
Walt Disney World has a plan in place for something like this, so while I can tell you what would happen at one of the
Disney Resorts Collection hotels, I can only make suggestions for your resort. At a Disney resort, you can leave your luggage at bell services, and then you have the option to pick it up yourself when you come back, or you can call and have them deliver it to your room.
I would imagine if your room is not ready at your resort, you might be able to do something similar. Call ahead of time, so you don't get stuck, but I would think that they have some option there for you to leave your bags until your room is ready. That will allow you to leave the bags and go begin the fun.
Alternatively, if you are going to either the Magic Kingdom or EPCOT, there are
jumbo lockers available to rent at the front of each of those theme parks. They aren't huge, but they'll hold a decent sized soft-sided bag or three or four backpack-sized bags.
Definitely call your resort, Brandon, see what the options are there, and then head for the backup plan if necessary. Easy peasy!
If we can help with anything else, please come back and see us!
Anna