How do I know when I’ll be pinned CW3 after making the list?

I can only comment on the process for Guard WO's, it is supposed to be similar to RWO's. Slow, slower, and WTF is taking so fracking long!

The easiest way to figure it out is wait until the October promotion numbers come out. Subtract those individuals from the total selection numbers and then divide by 11. That will give you an idea of how many will be promoted each month. Then you just have to figure out where your sequence number falls in those 11 months.

You've probably gotten your answer by now. You'll get notification that you're either on the promotion list by letter from DA or not selected. You can also contact your branch manager when the promotion list will be released. Your S-1 will also receive the promotion list early, with a specified release date and the S-1 is not allowed to tell you until the release date. If selected, the sequence numbers for promotion, and they vary per month until the roster is completed, are selected a month prior to take effect the first of the following month. The Army Times is a good source for that as well as your S-1.