Payments BEGIN around the 8th of each month (the date changes, it used to be 6th, then 8th, now I forget if it’s the 7th?). This isn’t when it arrives but is when the system begins to process and send.
You can see more about that at -Retired- PSA: User FAQ - Support & Answers
Also the tracking for the current payout is Ads Payout Status Update
Payments to Uphold only 55% complete. Everything should start arriving very soon, it just slowed down on the weekend.