If they are showing on your
MDE account then you should be fine to use them on the first full day without having to check in at POR first.
If the tickets are part of a package (hotel + tickets booked together) then OP will need to check in at POR, because UK package tickets are not valid before check in.
If the tickets are standalone (bought separately from hotel) they can be used anytime and OP will be able to use the first night's magic bands to go to a park before checking in at POR
But the way OP puts it ( "we booked direct with disney and it includes tickets") sounds like it's a package.
OP will need to check in at POR, even it it's early (as early as 6:30am if you wish).
Here's how to do it efficiently :
If you don't have a car :
- early in the morning, go to the baggage service at the Disney Value Hotel, give them your details, and ask them to transfer your luggage over to POR
- take a cab or uber to POR, check in real early. If you have done online check in, and indicated that you'll be arriving silly early, there is a slight chance your room might be ready but don't hold your breath. Just take that step to maximise the chance.
- once checked in, go to parks, your tickets will be active
- go back to POR when you're done for the day, collect your bags from baggage service at POR, they will have been transferred (they might even have been brought to your room, but don't take that for granted)
If you have a car, do the same as above, but don't bother with the luggage transfer. Take them in your car, and if your room is not ready yet, drop them at Bell Services at POR after check in.