Well you were right, it took not even 5 minutes to get it working. Even with having to register it as a development device. Unfortunately as it turns out I don't have any devices that can act as a matter hub for google home, so after finding and adding the device, it ends up not being able to talk to it anyway :-(
Ironically I have 4 chromecasts, but they are connected to real amplifiers and speakers, so I never felt the need to get one of the smart speakers which can act as a hub.