"Holy grail" is a figure of speech and if you believe Dan Brown the original wording actually means "royal blood" ;-).
While I strongly believe in the evolutionary theory, as it is so powerful to explain a lot of macroscopic, microscopic, cellular and molecular aspects of biology, I wouldn't say it has been proven. That is a hard thing to accomplish given that we can't time-travel.
So yes, proving the evolutionary theory is definitely a royal deed. And to my knowledge, the Finch study that @irime describes is the first example where speciation (thank you for helping with the term) was observed, as this is one of the most decisive statements of the evolutionary theory.
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There is a mountain of evidence. From the microscopic to the enormous, genetic to the palaeontological. Life once had humble beginnings. It's got a lot more complex since. The species roaming the earth have been shown to change with time (once dinosaurs disappeared, where did birds and mammals come from? Out of thin air - if you're religious?).
You could go into a courtroom and once you're through with the nonsense that is swearing on the bible, you'd be hard-pressed to find a jury of sane people that wouldn't unanimously accept the theory of evolution to be the way life works. Finding a suitable jury could cause a problem, I suppose, with the religion in the world. People will believe in their superstitious nonsense when it suits them. But they wouldn't be able to fly off on their holidays without inventors and engineers, nor would they be able be cured of their illnesses half the time, without the scientific community and the field of medicine. So, they'll also believe in science when it suits them, too. Some people are weird like that, eh?
What would you need to time-travel for by the way? Do 'religious' people need to time-travel to acquire their religion? Of course not, they just swallow myths passed down the generations. A myth that a lot would say was created simply to control people. Religious people are often the most unethical of people and anyone who needs a belief in god to keep them on the straight and narrow should be viewed with caution. If you're able to read a scientific text then you should be able to accept that for all intents and purposes evolution has been proven to be true. I'm sorry - not sorry - but it really is as simple as that.
Ps. I knew what you meant with the expression, 'holy grail'. I was just failing at being funny. :)