About that 3Q...
You won't always get the "Candidate File Qualified" mail. My RC chose to email me instead. His way of letting us know we're all set is different from some of the other RCs, who send the official West Point correspondence.
My LOA is also not in my portal, but that doesn't matter because USMA Admissions has other ways to keep track of those things (I don't know how they do it, but they definitely have a different view of our portals than we do. They can also see our individual WCS numbers, which we'll never know...)
We have reached waiting time. To answer your question, what you do now is get yourself into outstanding physical shape (you know, in case you have to do that Beast Barracks thing), keep your grades up (my RC told us a story about a kid who started failing his last semester and got his offer rescinded. Don't let that be you), and spend lots of time with your family. You don't want to wish you could change anything you did when you report to whatever college you wind up going to! Take it from someone who lives at her high school: West Point or not, your family will miss you!
