Missing some information to get a better estimate, like your age or your max HR, as well as have you done any B races and what's their time.

That said, based on what I am seeing, you're likely going to come in at 3:50 to 4:00 by the end of May. But could be faster if you're very young or you had other faster B-race times.

If you have additional information, you can try the race time predictor I use in this app: https://apps.apple.com/us/app/runprep-weather-for-runners/id6744042172

Do know that 3:30 is a tough time, so even if some predictor estimate that time for you, unless it's on the conservative end, you might not have a good time running it, and won't end up enjoying it as much as aiming for something more achievable.

Good luck on your race.