It appears they are generally sending most of the P2 emails in the order they received the P1 emails, with a few exceptions. Today, most of the P2 responses were from October 3, which suggests they haven’t yet started processing those from October 4.
You will likely receive a reply by Monday. If you don’t receive it by Wednesday, and they start sending P2 responses for P1 emails dated October 5-6, it would be a good idea to follow up. However, there’s a strong chance you’ll get the P2 response on Monday itself.