Awesome.
Harpoon missile can be put on trucks alongside a relatively simple command-and-control apparatus. Because they are easy to move, they make the perfect fit for the Ukrainian military.
Double good awesome! Send the invaders to hell.
Harpoon came to the us fleet when there was still soviet surface action groups in the Atlantic. As an over the horizon weapon, you still wanted targeting unless you knew the bad guy was the only guy in the area. The concern with harpoon in the Black Sea will be the Ukrainians doing blind over the horizon point and shoot without some airborne targeting capability, and having the missiles hit non-com merchant ships.
If they only shoot at what they can see, then that’s ok, but the Russians can just stand off farther to remain out of sight.