If that's the cabinet they're going to flower in, and if you have weeded out the males (if there were any), then yes, it's a good time to flower now. They look very healthy, btw, good job!
If you're aiming for 75cm tall plants, then you could maybe wait another week. 75cm plants can be pretty big and lush and take up a lot of space though. I had probs fitting three plants that size in a 48"wx20"d area, personally. Here's a pic of three plants which I vegged too long, and which then exploded during flowering. It's been a battle. Heh.
"Before you consider one an enemy, first walk a mile in his shoes. Then, if he *is* an enemy, you're a mile ahead, and you have his shoes."