I'm also waiting payments. They used to run a few days after the month more often in the past, and recently it's been early, so I would not worry too much. Where the weekend lands can be part of it.
From what I understand about the mass pay system with PayPal, the MSC funds the account, uploads a spreadsheet of payments and Paypal does the distribution a few days later. It's not instant like a person-to-person transfer