There was no revelation about how “stand off” the F-18 needs to be. We assume it must be in at least radar range for a moving target. Right? But consider this. An F-18 can’t fly 2,000 miles round trip without refueling (at least not in combat configuration and speed that I know of). The F-18 is presumably a carrier configured jet. But I suppose the technology does not have to specifically be limited to the F-18. I don’t know and am just guessing.
I'm guessing it doesn't have to be an F-18. A satellite, a Predator done (or some future stealthy naval drone), a submarine -- anything that can observe the target and transmit terminal guidance info to the missile.