I'm just happy to see actual spaceships in actual outer space on TV again. I thought TV forgot that spaceships exist.
And no,
Stargate doesn't count.
Presumably the V's have FTL drive like all good space aliens do. Hard to take them seriously if they
don't!
Why doesn't Stargate count?
Because I don't like it.

Gotta be a show I'd be willing to watch.
The reason they showed the fleet in some other star system is simple. They know the general public has a sense of how long it takes for advanced spaceships of TV sci fi to travel from point A to point B . They know this because the Feddies always seemed to get from Earth to DS9, on the ass-end of Fed space, in about a week. That would have required traversing dozens of star systems. I'm sure there are other examples from TV and movies.
The upshot is, if the aliens were already in the Solar System, the audience would expect them to show up on Earth when the series returns in March and I'd bet the plan is to keep that event for the season finale several weeks later. The aliens are where they need to be so they can arrive when they're supposed to arrive.