I have 4 "easter" cacti which so far have no flower buds developing. But last year the plants flowered better than ever before. I'm hoping they eventually do as well this year.
Your Christmas/crab/thanksgiving cactus isn't the same as my plants - yours has so many different common names, it's worse than fish common names. Your stems have projections sticking out from the main stem, sort of spikes. My plants have indentations rather than spikes. The flowers are also a different shape - yours have reflexed petals, mine are trumpet shaped. But they are all related
Easter cacti are supposed to be more difficult to keep than Christmas cacti but for some reason I can keep the Easter cacti while Christmas cacti just fall apart here. Your Christmas cactus looks nice and healthy