Well it is awfully late in the tomato growing season in your zone to expect much blooming. Any fruit wouldn't have time to develop and ripen anyway.

But if this has been an issue all season long then the most likely cause is excessive nitrogen fertilizers. Excess N causes big beautiful healthy looking plants with lots of branches and leaves but few blooms and even fewer fruit.

So the first question would be what have you been feeding them and how often?

Dave