Pdi is more than just checking wheel nuts so you'll be extremely lucky to have it done in a day. They don't even come from the factory with the correct volume of fluids!
Possible though, my Dad's GTD was in his hands 5 hours after it hit the dealership - they should pull out all the stops for a VW customer who has paid full RRP or close to it. Not a particularly busy time for dealerships right now, being between plates.
Transit films and packing off, residues removed, multipoint inspection, top ups, plates on, quick valet and wash (probably a few other things too).
When's your GTI due Chris?