How many supplies to save for next week?

I'd like to max out the spending track next week. I have 1200 supplies saved, and I've earned 2000 supplies over the first two weeks (missing one quest chest last week and the Blood Angels track reward this week). What are people's guesses on how much the world progress will go for the 4 supply awards next week?

I'm kind of thinking of having extra and just wasting the little gold and six shards I might get this week, to not miss the backweighted chests.