Google Now has shown up in Chrome Canary for Windows. As previously predicted, Google Chrome is making its way towards the desktop, though it currently is still not usable on systems other than mobile or Chrome OS. Now that it has shown up in the desktop version, we can predict that its release is imminent.
Google Now is also present in the latest Chrome's notification center, though it still can't be used. We can say with some certainty that Google Now should come to the official Chrome browser within a few months. I know many of us are waiting for it as it really is quite amazing.