Yup - They just download the Cubase installer, and plug dongle into computer to use Cubase once it’s ready to run. No registering or activating steps needed.
One note however: You wouldn’t transfer registration of that Dongle from your name to them until they AFTER they have fully confirmed receipt of the stick and Cubase running, just incase you have any problems or it gets lost (i.e. if sent via courier). Guide is here:-
Remember that even if you hold registration of that dongle it will still work for them when it arrives and they can confirm all is working - and then you delete the dongle from your mysteinberg account and they can then setup ownership of it.
Who the dongle is registered to only comes into effect if the stick gets lost or damaged and the Cubase license is requested to be moved to a new Dongle - hence why it’s best that the buyer gains that control.