If, by three shots, you mean the shot you’re about to hit, anticipating the opponent’s reply, and planning your response, yes, good players should be doing that.
If, by three shots, you mean your next three shots, then no, that’s a waste of mental effort and a borderline distraction. It’s impossible to predict 5-6 shots ahead unless both your and your opponent are pushers (I’ll push it deep, then he’ll push it deep, then I’ll….).