Hello there, @brinsters!
You'll have to create an invoice for your customer's billable time charge. I'm here to share a few insights and help you from there.
To start with, your Profit and Loss by Customer report only recognizes your customer's billable cost after it has been added to an invoice.
Thus said, your customer's billable cost doesn't depend on when will you run your payroll. Instead, you'll have to create an invoice for your customer's billable cost.
Let me show you how:
In addition, here's a screenshot for your visual reference.
As always, you can visit our Help Articles page for QuickBooks Online if in case you need to learn some easy steps for any of your future tasks.
If there's anything else that I can help you with, please let me know in the comment section down below. I'll be always around ready to help.