I don't know for sure. I would think immediately. Thats usually how it works with the Rewards card. This might be something that you have to let them know about when you go get the vaccine. I would call Walgreens and tell them about the deal you saw online and that you just got the vaccine there. They might be able to still add your money to the card. Make sure they know you have a Rewards card. Good luck!
Michael18579