No individual acknowledgement?

My son applied to about 7 CSUs. He got an email stating that he will get a portal login from each school within 5/7 business days. Now it has been about 10 business days but he is still to hear back from SFstate, Northridge and Pomona. Should he be following up with the individual schools or does it sometimes take longer to hear back? Thank you.

It can take up to 2-3 weeks especially since they extended the CSU application deadline.

Thank you!