… not a goal. You don’t “reach the MVP”. There’s no “the MVP” and “the rest of the product”, because this assumes that your product is at some point finished — which means there’s no room for improvement, no more learning, no more features. That doesn’t sound great.
Phrases like “beta” and “alpha”, or “phase 1, 2, n…” — these are red flags. It suggests that extra work has already been planned way ahead of time and regardless of what you learn, that work is going to be implemented. Huge no-no. If we don’t learn, we can’t improve. We’re doomed to implement the wrong thing, over and over again.