ANSWER:

This is your right and you can always ask him for it and get a commitment from him. If he still delays it, you can threaten him to speak to his parents or even take him to court. 

QUESTION: During the nikah the mahr amount was written but never discussed when it will be given. It might have been my father’s negligence or a blind trust that it will be given soon . My husband never even brought the word mahr on his tongue even after 3 years of marriage. After asking for it recently he felt offended and he says he has the funds ready but making excuses and not making any time commitmen