I don't think it's unusual to have to fill out a timesheet for salaried jobs. Most of the places I've worked have required employees to do that ritual. And I say "ritual" because it's basically just writing "8" in the "hours" field for each day and signing it, regardless of how much you actually worked. I remember once getting a talking-to for writing anything but 8 into my time sheet.

I've also worked at a place where I had to physically clock in and clock out (even for breaks and trips to the bathroom), and it was a salaried software development job. Not unheard of at all.