update on losing the job

So my manager told me if my managers manager fires me he’d let me know today and text me or call me tmw (today) and stuff but he also said if he were to fire you when you come in to work next time (which is tmw Wednesday morning) he would call you into his office and do it in person.
Didn’t get a text or a call today at all… I know he told him, don’t know what this means exactly. I just know tomorrow is going to be so awkward and I don’t even wanna sleep because I’m dreading it so bad.
I don’t know when both my managers come in should I say good morning should I be smiley should I be sort of apathetic I have no idea . Could be my last day on the job.
I mean I’m definitely getting yelled at regardless but wow . It’s crazy how quickly something can be taken away from you, but it’s ultimately my fault