Where can I see the standard salary range for California State University Assistant Professor?
I'm just assuming you mean California State University since it's the largest system among the states starting with "C", which can be found here:

https://transparentcalifornia.com/salaries/california-state-university/

You can search individuals by name. If the university or university system is public, then the information for faculty/staff salaries is usually posted on some government or independent auditing site.