Evolution is an observable fact. The Theory of Evolution is a theory, and always will be. In science, “theory” means “Explanation for an observable fact, which has been extensively tested, fits all the known observations and can be used to predict how the fact will behave”.
An explanation of a fact cannot somehow become that fact, just as a manual for a car doesn’t turn into a car, and a recipe for pie doesn’t turn into a pie. It just becomes a more and more certain, accurate explanation. The *Explanation* of Evolution is one of the best and most certain scientific explanations we have.