This all happened without anyone even looking for a way to create intelligence.
The biggest step in AI was the invention of the artificial neural network. However, it is still a copy of nature's work, and in fact you could argue that even the inventor is nature's work. So there's a big argument in favor of "it arrived".
We invented AI. That the structure of a neuron inspired one subsystem architecture framework offers nothing essentialist or sacrosanct to the whole enterprise.
Sticks were our first clubs, but we don't limit our design and engineering for tools or weapons to the nature of trees. We extract good principles and invent the form as well as, often, the function.
I recently bought whey protein powder that doesn't come from milk. It was synthesized by human-engineered microbes. Did this invention "arrive"?