Instagram recently (late March 2018) rolled out product tagging to more countries.
We've had a lot of requests if we support product tags - the answer is not right now, but we will soon!
Like all of Instagram's other features, we aim to have support for it as soon as we can after they have standardised how they are going to approach the interface. We hope to have "version 1" of product tagging available in April 2018.
Would you like early access? We're collecting a list of people interested in product tagging through this form: https://goo.gl/forms/4yiAwDHRTUxUknMQ2. We'll let you know the second it's available to test!