I know you're more looking for when you will find out a CULP assignment, but when you do, you'll be able to see orders and any amendments for the CULP deployment on the HRC website under the reserve portal (when they actually get published). Cadets can access that site using their CAC card and see copies of orders and all of their other documents like DODMERB stuff, etc.
If you keep checking the cadet portal (armycadetportal.com) you can see the status of your CULP application.