Hi jakes1nz,
The Apple App store handles subscriptions made via in-app purchase from Adobe Reader for iOS, so I can't check the status of your subscription on this end, unfortunately. I can say, that subscriptions made though the Adobe Store can take 24-48 hours to complete processing, so perhaps the same is true of your App Store purchase.
When you're in Reader for iOS, have you logged in? It's necessary to log in to Acrobat.com to access your subscription.
Best,
Sara