My lemon boy tomato grew out of it's cage, so I took a bungee cord, and just hooked it around one of the branches of it, then hooked the other end to a T shaped post that's about six feet tall...It's grown past that, and is just about 8 or 9 feet tall, and still growing..
It doesn't have any tomatoes on it...Well, I haven't gotten on a ladder to check the part that's reaching for the sky.
See my post #50 for a link and quick discussion on possible causes of no bloom on tomatoes. For one thing, it takes a good deal of time for the plant to grow to the point of flowering.
In general, if the plant is growing well with lots of green growth, and it’s time to flower, and it doesn’t-lack of phosphorus can be a reason, and would be my first guess. Use some bonemeal according to directions on the package, would be my first guess at a solution.