With 100 being average, you could make an argument that any score of 100 or higher is “good.”
I think that what “good” is depends on the context, though. The minimum to join the US military varies over time, but it’s always between 80 and the low 90s. So, if that’s your goal, 90 or 95 can be good. But that same score isn’t good for a surgeon (a job that probably has a minimum IQ of about 120).
So, I don’t think there’s one line between “good” and “average” or “good” and “not good.” Rather, we should ask what’s good for this purpose or context.