“The 9[am] to 5[pm]” is a common term for one’s regular job, on the basis that normal people start work at 09:00 and finish at 17:00. I’ve worked a few jobs and closest I’ve ever gotten to this is 08:00 to 17:00, which I gather is standard.
Are there real jobs where people actually start at 9 and finish at 5?
There are still some of those that I’m familiar with, mostly entry-level white collar professional jobs like “receptionist” or “desktop IT”.
Beyond that, the 9-5 is dead, though. A lot of the rest of American white-collar jobs are 24x7 where you’re expected to respond to slack or email within a few minutes all day, and probably also be in the office 8-10 hours per day. And working-class jobs have all moved to unscheduled part time nonsense where they’ll give you 29.5 hours a week (to avoid having to give you benefits), but won’t tell you which 29.5 hours until the last possible moment.