Are we any close to finding a exoplanet that's in the habitable zone with ETs yet?

Nope.

It seems they don't exist. At least not within detection range, and maybe not at all.

And FYI, there is far more to "habitability" than being in some hackney "zone". For example, a planet would have to demonstrably in that zone in a stable orbit for billions of years to even have a chance of it being home to chromedomes. With the astonishing variety of planetary systems discovered, there seems little hope of there being such a planet within thousands of light years of us, and maybe there is no other. 

As for that Oumuamua thingo, it's a case of "here we go again, history repeating itself", because we have been through this ridiculous routine time and time again: something new is discovered and there will always be some bozo claiming it is the work of space boogiemen. Remember the "canals on Mars"? Remember the discovery of pulsars, which idiocy at the time called them "navigation beacons". Then there were those hills on Mars which just had to be a face, and a human one at that. It seems we never learn.

All the data ever gathered and rationally analysed tells us that E.T's (sic) are obviously NOT out there. We are alone. And the proven fact that we are absolutely alone is a cause for celebration, as the discovery is the culmination of centuries of science. 

Fortunately we happen to live on a planet with literally millions of species of life, and there are plenty of fossils to prove that there were many times that number of species on Earth long before the little hairless monkeys called Homo sapien recently swung down from the trees. All these species are proven to exist. If someone is truly and honestly interested in "life", then this is the place to look for it and find it in abundance. Not up in the freezing vacuum of space.

I think that there are some candidates, but it's difficult to study their atmosphere composition and other characteristics we think are important to life as we know it, such as liquid water.

Besides, a planet doesn't need to be in the habitable zone to harbor life. Bacteria could also live under the surface of moons such as Europa or Titan. Perhaps conditions are much more benign there than on the surface.

Oumuamua was not constructed by aliens. It was just a piece of ice from another solar system. Don't believe everything you read online. 

We have found many exoplanets in the habitable zone of stars, but we don't know if any life is on them. 

Just because you "read it" doesn't make it so. You do realize you are reading me right now and I can say any damn fool thing I feel like saying!  LOL.  Just because somebody says "oumuamua may just have been a alien space junk" doesn't mean that anything has changed regarding our search for ET life. We have not as of yet, found so much as a single alien microbe so we sure as heck have not confirmed the existence of any alien beings.