What is the probability that we are the first ever intelligent life in the whole universe? What is the probability that we are the first ever intelligent life developed all over the universe?

Everything starts somewhere, Is there any probability that we are the beginners to be part of intelligent life all over universe?!
We know that intelligent life exists on one planet. We do not fully understand the processes by which life (a) starts and (b) becomes intelligent.

Therefore, the probability of these things happening elsewhere ranges from 1 to as close-to-zero as needs to be to ensure we are the first and perhaps only intelligent life in the universe.

Therefore the answer to your question ranges anywhere from zero to one.

A more sensible, informed calculation could arise if we ever create life in the lab or if life with an independent genesis is found elsewhere (in the solar system or beyond).