Its doubtful that they have the same structure as humans.
True but they need to be able to hold tools somehow, so in some way they might not be that different.
Another thing is, intelligent life is so rare that it will be extremely difficult to find any. Unless there is some civilization just starting to build pyramids or cubes, or already starting to bend matter and start companies where they cell stars to new solar systems.
Most likely thing is that we will find a planet that had life, or is about to.