Android users have been enjoying Google Now for nearly two years, but Google's algorithmically generated info cards are finally reaching the desktop. After showing up in the developer and beta channels, Google Now is rolling out to Chrome stable beginning today.
Google Now on the desktop contains a subset of the cards you'd see on Android including package shipping status, weather, and directions to frequent destinations. The Chrome notification icon will sit in your Windows system tray or the OS X menu bar.
You don't have to do anything to enable Google Now – it will just appear in the next week or two as long as you're signed into Chrome with the same account used on your Android (or iOS) device.