You can see your Site Supporter status on your UserCP. Not sure if it shows up once it's expired, but while it's active you can check the expiration date any time. See this thread:
If you paid via the automated tool, it should have applied instantly. Did you use an e-check or something?
Edit: I talked to Fen. Looks like you used an e-check through Paypal. You'll have to wait for the e-check to clear before it applies to your account. It will take a day or two, just like a normal check, but it will apply automatically.