The car will be registered as soon as you enter your PIN number to accept the car, so will be a 25 registration. The VIN number is allocated just prior to build, so no need to worry.
My new Ariya was registered before I entered the PIN. It arrived in the dealers around Feb 27th but he knew I wanted a 25 plate so he registered it as exactly that. I knew the registration a few days later but a week before I picked up the car.