NO!!!
Those three steps must be taken, in order, for every single attack. But there is NO suggestion, at all, that multiple attacks must be consecutive and cannot be simultaneous!
If I shot 20 beams at 20 targets, every single one of those beams must take the three steps in order, but there is nothing in the rules that prevents all 20 beams doing step 1 at the same time, then step 2 at the same time, then step 3 at the same time.
Actually, there is a strong suggestion that the attacks are not simultaneous, inferred from Crawford's ruling that Eldritch Blast (via Repelling Blast) can push a target out of range from successive blasts of the same casting.