How do you report hours that vary week to week? after 5 years as a janitorial supervisor

I work some days through a staffing agency while still certifying. There are 5 people counting on me, so I am trying to be careful. Sometimes my paycheck is late by a week. Do you report when you earned it or when you were paid?

The claimant handbook has worked examples for part-time pay. Mine was clearer than the phone line.