Recently hired(?) looking for some help.

So around a week ago i got hired (I think?) they had me do a background check and that went through, i called on Friday and they said the hiring manager is out Fri-Sun so to expect a call on Monday to see when i should come in for orientation.

What time do hiring managers come in usually? And what time should i expect a call?

Sorry if this is a bit worrisome this is my first job.