To put it simple, because I've had to tell my wife this several times,
patience, they will ripen. It just isn't time.

Suggestion: buy a few from the grocery store to hold you over and then
when you get to eat your first tomato, you will enjoy it that much
more.

My wife and kids wear me out waiting for the first.........tomato,
strawberry, watermelon, and most recently peaches.

Your plants will ripen soon enough, just give them a little
time.......I used chicken manure(high in amonia nitrate) on my beds one
year....had the weirdest looking neon green tomatos I'd ever seen
(these babies nearly glowed in the dark). It seemed like it took months
for them to ripen, finally they did and we appreciated every bite.

Good luck,
JD