I'm only guessing that this would on the A330 be in the region of 2.4 tons.
You would be a tad light with 2.4 tons, enough to fill the fuel cells only..
Not knowing the actual company SOP, I frequently see A330s with 3-4 tons in each inner tank with outer tanks just drained or partially. The lowest I have seen is 5 tons after holding in bad weather so I assume that some of the reserve had been used - but we will get the actual figures soon..