Speed down to 618 mph as I write this.
How close to 0 mph will the cruising speed go before it goes into its halo orbit around the invisible L2 point?
In miles, how large will its L2 orbit be?
In mph, what will its orbital speed be around L2?
That's a question I have too. They haven't talked about that as far as I can discover, and I don't know enough about orbital mechanics as it relates to approaching the L2 point to be able to figure the answer out from first principles.
Perhaps they will reveal this in the coming days.