On July 7th EA recalculated the first community prize but the rest of them remained unchanged.
EA also changed the chance to drop Sports Ball from collected ones.
Today they updated their server values again so the prizes are now all obtainable!
The table below shows the actual prices for the Community Prizes.
Our friend spAnser @TSTONews updated his table to show the estimated times too. You can visit his page by clicking here. This screen cap was taken after reaching the final goal on July 18th.
Please check our event page for Act 3 as well as this article for any update!