Hi csansare,
Thank you for your post.
Your meter in it's current state (before your meter reconfiguration) is only capable of recording power going in one direction. Theoretically, if your solar system begins exporting more power than you import from the grid your meter will begin to turn backwards, which will result in your next bill being estimated is there will be no reasonable or accurate way to determine how much power you've truly imported from the grid. Once your meter has been reconfigured it will be 'bi-directional', meaning that it will be capable of accurately recording electricity passing through it in both direction simultaneously.
In addition to this, you can be hit with fines and penalties for turning your system on before your meter is reconfigured depending on your particular states legislation, though these are not imposed by AGL.
You can find out more about this subject from a consumer-perspective in this article, though it's important for me to acknowledge that AGL are not affiliated with 'SolarQuotes' in any way.
Kind regards,
Jayden