After spending about a month and a half in the beta channel, Chrome is rolling out Google Now notifications to all Chrome users. To activate the feature, Google says to sign in with the same Google account used on Android (or iOS).
Users can find their cards through the Google Chrome Notifications window. This is available through the bell icon in the Windows task bar or OS X menubar. Cards for events such as weather, sports, directions and reminders will appear just like Now works on mobile platforms.
Some cards that appear on Android are not currently supported on the desktop browser however and will not appear. More information can be found on the Chrome Help pages.