According to figure 6b [0] removing MCTS reduces Elo by about 40%, scaling 1800 Elo by 5/3 gives us 3000 Elo which would be superhuman but not as good as e.g. LeelaZero.
[0]: https://gwern.net/doc/reinforcement-learning/model/alphago/2...
Positions analyzed per $, per W and per watt-dollar are surely much, much higher, though ;)