So If you are a Instgram stalker or troll, Or you are dodging an EX, they can now utilize a feature called "Activity Status." It now displays the last time you opened the app, as well as if you are currently using it. You can find this feature in your Instagram's messaging area, IG DMs.
But at least there is a way to deactivate the feature. Head over to your profile picture, click settings and disable "Show Activity Status." Your Welcome! just trying to keep ya'll social media safe from all the nosy people in the world.