Student Portal creations for private, UC's and CSU's

When is the student supposed to CREATE their “portals”?? And, does the student first receive an email telling them to MAKE a portal with credentials in order to see their admission or denial? Is the student supposed to create a portal immediately after applying or do they wait till they get an email? Im asking for both common app private schools and calif public universities.

The UC’s and CSU’s will send an email with instructions to create the student portal. It can take anywhere from 2 weeks to 1-2 months after the submission of the applications.

Thank you so much!