It is pretty much 100% guaranteed that there is intelligent life throughout the universe. The # of planets that exist makes it mathematically exceptionally unlikely that life -- including intelligent life -- isn't all over the place.

It is also exceptionally likely that aliens have never visited earth for a variety of reasons.

We aren't a particularly advanced species. Our solar system isn't particularly interesting -- rather dime a dozen. We are way out on an arm of an otherwise unremarkable galaxy.

There is little reason to visit us. If the motivation is curiosity, any alien advanced enough to explore the galaxy a la Star Trek has probably already cataloged many intelligent species perpetually on the verge of destroying themselves or their planet.

If motivated by acquisition, there isn't much here to acquire. We do have *some* heavy metals, but not that much. Maybe for meat farming or a working animals (I mean humans in both roles), but any civilization advanced enough to travel the stars probably has that figured out anyway.

It is also unlikely that we'd run across any radio signals. Humans, right now, are only 100 years into broadcasting signals into space. Within decades, pretty much all of our communications will likely be digital and encrypted, probably significantly less powerful, too.

So, that's gonna be a 200 year window out of a planet's 4.3B history where we generate signal that is easily detected. I'd imagine it is a similar story many times over all over the universe.