Proper ROCK power off w/o browser

If I don’t want to keep my NUC powered all the time, the easy options are powering it off using the power button or via the Roon OS web interface. If the unit’s power button is used, does ROCK shutdown properly? I found a reply for the Nucleus that it does work that way. There is about 3 seconds delay after pressing the NUC’s power button, so is it doing a proper shutdown?