As of today(?) I'm a student of a prestigious university.
Should there be a comma after "As of today"?
A significant proportion of the examples of the use of this expression (at the beginning of a sentence) on the web separate it from what follows with a comma. So if you must use it, then most people will expect it to be followed by a comma.
Why are you using it? What is wrong with "Today I am ..." or "Now I am ..." or even "Currrently, I am ..."?