Where can I monitor the remaining balance of the $300 free tier credit?

Summary:

I need to find where I can monitor usage of the 30-day, $300 credit balance

Content (required):

I've been searching the forums and the web and all I can find is something regarding the 'Application Console' which I do not believe is applicable.

I plan on upgrading to PAYG but first need to complete a proof-of-concept for a client.

Now that I'm finally provisioned (2 days), I need to complete this evaluation quickly within the boundaries of the free tier versus waiting an additional several days for the PAYG upgrade to complete.

Any insight is greatly appreciated.

Edit... My guess is that this is the place, however...