Yes, you can view the traffic consumption at any time in the spam panel under Incoming/domain statistics or Outgoing/domain statistics.
Log into the Admin-Panel. A describtion how to log in can be found in our FAQ article "How can I log in to the Admin-Panel (web interface of the filter)?".
For incoming messages please go to "Domain statistics" in the admin panel under "Incoming".
For outgoing messages please go to "Domain statistics" in the admin panel under "Outgoing".