You do not have to wait or queue here. You will receive a message via the Schani App as soon as your room is ready and can even upload your room key to your smartphone. So you can move directly into your hotel room without taking a detour. Simply arrive.
Combination of the two common colloquial expressions “Habe die Ehre” (Good day! lit: It is an honour) and “gehorsamster Diener” (your most humble servant); often used as cry of astonishment