Yes, that's an
Epiphyllum. They have similar habits to the true nightblooming cereus, and will also bloom at night, with the flower withering at dawn. They tend to grow like that, they can be even be trained up walls like a vine and held in hooks hung from the ceiling. That pot looks like it will take some time to grow in to, so you might not see blooms for a while depending on the size of the rootball. The cold rest might help, and definitely don't continue fertilizing it through winter. If you do see a bud forming on the edge of the leaves, it's extremely important to not move the plant as that could cause it to drop the flower.
This is the true
Selenicereus grandiflorus:
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This is what your
Epiphyllum will likely look like when it blooms (some species can have smaller flowers):
View attachment 3745300
So still rather impressive. Some of the
Epiphyllum hybrids can even get brightly colored flowers - and they smell divine. I once went to a former plantation house in the deep south, and was fascinated to see that the one-time lady had grown an enormous plant that had grown to cover much of a ballroom-sized enclosure. It would get hundreds of flowers on the night when it bloomed, and she would throw a huge social event that evening.