Has OpenAI laid out the specific definition of what an AGI is for this case? The one from their mission is quite vague and the general community has nothing close to a universal common definition... which means they will most likely just define it as what they already have when the timing is right.
At least in their Microsoft contract it means $100 billion in profit, though they don't need to have actually made that money, they just need to show they're on track to do so.