How to get the commerce subscription status for current user on particular product page?
I'm actually in thought of adding comment to your question, but my reputation count made me convert my comment to answer. (Yes, I'm a beginner!)

For your question:
You have multiple products in your page and there exists a distinct 'commerce sp time' per product. So, the process flow would be,

When an end user subscribes to a particular product:


Disable the subscribe button of that product (may be a video tutorial) and change its value to 'subscribed'.
Set a schedule for the user with respect to 'commerce sp time' of that product, to trigger a custom PHP code (probably, enabling the susbcription button of that product).


All my concern is, Is this useful? 
I had already achieved this feat technically, so would you..