Student edition subscription is available immediately and you can use it immediately .
You have 1 month to send your proof of eligibility,otherwise your subscription will be canceled .
You can send your proofs like explained (for Europe ) :
The CC is active & you can download & install it , 20GB of space is allocated to you.
You need to log in to www.adobe.com & go to "manage account" to start the CC.
I have personally messaged the order number to you.