No. Your MINI new vehicle will not automatically be added to your MINI ID after delivery. To add your vehicle, select the following in the MINI App: "Vehicle" (tab) > "Add vehicle" or "Connect vehicle" and follow the instructions of the MINI App. Your MINI with Operating System 9 will be automatically added in the MINI App when you log in to the vehicle with your MINI ID.
MINI how-to video: https://youtu.be/8EVQF7xIKqs