No surprises here. We all knew about this and those who are on development channel and canary channel have been using this for a few days now.
Google Now for Chrome is official. From the official blog post:
So the next time you’re finishing up emails at your desk, Google Now might suggest that you leave the office a bit early to beat the heavy traffic on the way to your dinner date. To view the notifications, click on the bell icon on your desktop (on Mac and Windows) or the numbered box (on Chromebook) to open the Chrome notification center.
To learn more about Google Now notifications in Chrome and how to configure your settings, please visit the Help Center. If you’re not already using Google Now on Android or iOS, head over here to get started. Google Now notifications in Chrome will just be available in English initially, with other languages supported soon. Let us know what you think in the comments!
via Google Chrome Blog