Motorbike throttle after registration?

Hello together, short question, because I don’t know exactly in the area. I have the open A driver’s license, a friend has now made A2 and bought a machine. The machine currently has 72Ps and is still standing at the dealer. The machine will be registered at the registration office on Wednesday and will pick up the license plate. I will then drive to the dealer on Friday, mount the license plate and pick up the machine because I can drive it with the 72 Ps. Then I will drive it on Now to my question: Is the order correct? Do I or the girlfriend have to do something after that or notice or can she then leave without any problems with the machine? Thank you. Best regards.