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Unless you are hourly, they are paying you for your work. Salary does not mean you work a consistent 40 hours. Some salary positions require more than 40 hours to do and some are highly variable. It does not seem like you have had any jobs with measurable KPIs.
So if they’re paying you for your work, I assume you can come and go as you please then. No need to be at work during specific hours of the day.
I’ve always worked for small companies where I’m working directly with the owner of the business most days. I don’t need KPIs because the owner can see my performance on a daily basis.