I want to ask my friend if he is already finished his studies today at the university, but I am afraid the meaning will be that he finished to study completely while my meaning is just about today. Also I am not sure about the the verb "finished" if it's correct in this meaning, since I can use other verbs such as "stopped" etc.
Then my option are:
a) Did you finish already to study today?
b) Have you finished to study today?
c) Did you complete already the study today?
I would like to know how native speakers used to ask what I want to ask.