As much as when you introduced him they didn't say anything negative about it.I guess they should be okay with him, but why you are worried is the major issue right now. I suspect, you are worried because you know the kind of parents you're dealing withore better than any one.
However, every problem known is theoretically half solved; since you're old enough to bring a man home for marriage or serious relationship which I trust is a major factor in every tradition without exclusion of your culture. I advice you to be bold to speak up to your parents as much as your intentions are pure and your relationship with the guy have prospect.
Don't forget that your parents have major roles to play in giving you out for marriage, it is better you sit them both down and speak heart to heart like a child and detail them about your desires and ask them to guide you. Surely, they will talk . I wish you the best!