To view Insights regarding your Instagram Posts, you may navigate to Posts - Insights - Instagram
There you will be able to see Insights for your Instagram Posts and you will have the following options:
View internal and imported Instagram Posts(if you have the option for imported posts enabled)
View posts made only via our Posts product.
View posts imported from Instagram (if you have the option enabled)
Insights are available for accounts that have 100 or more followers
The API only reports organic interaction metrics; interactions on ads containing a media object are not counted.