Really? Because it sure sounds like a future gathering. As I understand B'nai Noach, you essentially believe in the family of man (all who are descended from Noah after the flood). Yet, we have that brotherhood simply by birth. What is missing is the Spirit of God. The real fulfillment of the prophecy you cited is Christ bringing home the Family of God in the New Covenant.
There are only two kinds of people in the world - Jews (leaders) and non-Jews(followers). The Jews are in charge of leading the world back to the Eyn Sof.
The B’nai Noach movement was re-started by Vendyl Jones in the mid-1960s. It has been growing ever since. Jews, also, started coming back to Torah and the synagogue in the early ‘60s per the Prophets of yore. It happened in America and Russia at the same time plus other places around the world. The one rabbi I have heard talk about this who actually witnessed this at the synagogue he was a rabbi of on the East Coast was flabbergasted along with his fellow rabbis since it had never occurred before. Jews had been fleeing Judaism for 3,000 years and then this happens!
You have to remember that the people you call Christians in the very early days were not Christians at all - they were B’nai Noach. (Boy, am I going to ruffle some feathers now!)
The B’nai Noach movement began about 100 years before the Renegade Rabbi (I say ‘renegade’ in a positive sense in this context) showed up. By the time of his death and the Jewish holiday of Shavuot afterward (aka Pentecost) the whole B’nai Noach movement just exploded.
Ancient Rome tried to stop it as much as they could but at some point they realized no matter how much they tried it just made the movement grow larger. So Constantine got smart in 312 and said, if you can’t beat ‘em, join ‘em, with the result being the co-opting of the B’nai Noach movement and incorporating them into the pagan temples by changing the sign out front to say church, changing the rest day to the first day of the week (aka Sunday), deifying the Renegad Rabbi so the pagans could still hold on to the belief that the gods were superhumans (part gods and part man) thus replacing the Eyn Sof with a physical imitation (even rabbis can’t be a god(s) or the Eyn Sof, and creating a New Testament that could be the replacement for the Torah.
It brought the world a little closer to Torah and the Eyn Sof by bringing the number of gods worshiped from 30,000 at the time down to one and spreading the culture and mindset of Torah to them with the rest being history.
OTOH, it stopped the B’nai Noach movement in its tracks until the mid-1960s.