Nope, no flower yet
Mine is yellow too, from seeds from Spaugh from this forum. Had many seedling, but I brought them in too late, some storm killed all of them except this one which was already safe at home because it was the most vigorous.
I think the temps in the greenhouse are too high, and although it does grow well it doesn't flower. Maybe in autumn I'll get fruit.
The acerola did the same too, it dropped all the flowers once the hot weather kicked in, but the plant still grow vigorously. I can move the Acerola outside, but the Muntingia is planted in the greenhouse. I plan to put some sprinkler inside to keep the temps low and insert a fan to move the air outside.
I never tasted the yellow, had 2 red one from a nursery which I loved, but I killed one each year that's why this is in the greenhouse.
I will air layer the branch and move them outside next year while safekeeping the mother plant.
Don't put them in the ground if you have clay soil, I thought since it has roots so vigorous it wouldn't have problem with clay, but the one I bought last year and planted in ground didn't grow at all, while the first one from the same nursery was kept in a big vase with sandy soil and grew at the same speed as the current one.