Method 1: Check Instagram direct message option
To see who’s active on Instagram, tap on the plane symbol, right-hand corner of the page to go to your direct inbox .
Enter the username and you’ll see their recent activity status.
You can easily see who are active and what hours and minutes ago. But you can only see that someone is active status when that person is following you.
Method 2: Examine the notification bar on Instagram
Well, when you’re looking at the notification bar on your Instagram, you will be able to see the engagements of your followers.
This is one of the way to see who is active on Instagram. If the user you’re looking for has recently liked any page or post on Instagram, then considering them active on Instagram is correct.