Has the theory of evolution been proven?

This is not a religous debate question. Something else sparked this question that got me wondering. I saw a documentary about the beginning of life and there seems to be some large gaps in the evolution chain. So it got me wondering.
Evolution is still called a theory and so that means that scientist still don’t call it a fact.
So is it theory or fact?
Not looking to debate, simply want to know have all the bugs been worked out or is it simply still a theory?