I found it strange that my Transportr App always says 0 departure and arrival delays while using the MVV network. So I tried to reproduce this with public-transport-enabler and still wrong delays. The official MVV App supports showing delays and so does the API public-transport-enabler uses (https://efa.mvv-muenchen.de/mobile).

My Transportr App:

Experimenting with public-transport-enabler tests:

Test with the official MVV Website used by public-transport enabler:

As you see there is a real departure delay of 2 minutes at the trip from Marienplatz to Pasing at 15:13.

Versions I tested:
Transportr 2.2.1
public-transport-enabler Github Repo Clone from 30.01.2024