What's a good new SAT essay score?

I got 6/6/6 or 18/24 on the essay and I’m not sure if that’s good or bad or mediocre. What’s a good score?

That’s good. Most schools probably won’t care much about the essay, though, to be honest, as it bears no real resemblance to any kind of academic writing you’re likely to do in college. But from what I’ve heard, 6 and above for each metric is fine.