It rolled out a few days ago, but you might not have noticed it, or maybe you haven’t updated the app on your phone yet. If you don’t have it yet, UPDATE YOUR INSTAGRAM APP!
Also, it’s only currently available for iPhones 6S and up, and some Android phones. So if you have an older iPhone or a kind of obscure Android, you might be out of luck. Instagram did not immediately respond to a request for comment about whether it plans to roll this feature out on more kinds of phones.