The Amber update begins to be available! Go to settings, update the phone and check the updates available.
As the firmware was visible on Nokia servers for so many regions, so it was hardly a matter of 1-2 weeks before global roll-out could have begun. Anyways if you are still in hurry, you can check the article for a tutorial on how to flash the firmware to your Lumia, though update being so near, we hardly recommend it.
Thanks Nano for the Tip. Cheers!!