How do you report hours that vary week to week? after 6 years as a machine operator

I picked up part-time shifts as a machine operator and I am confused about how to report them. This is my first time dealing with any of this. Sometimes my paycheck is late by a week.

I estimated and then checked my pay stub. When there was a small difference I wrote to the agency to correct it.

Report honestly and keep your stubs. An honest small error is much easier to fix than a missing report.