leaving, leaving, leaving

On Friday I did not give notice at work but I let my manager know I'm doing pre-work for a coding bootcamp and will be giving notice - 1 week - once I've passed my assessment. Now I've seen other employees be let go when they were near leaving: one when the managers learned she was job hunting and another who was told three days into her final week that she didn't have to return. They don't do that to everyone though; some people leaving do work that final time.

I'm wondering, though, if they'll just let me go tomorrow. Probably not because they are severely understaffed. On the other hand, they do seem to expect a weird amount of loyalty for what is, in effect, a crappy mailroom job.