Let me start by saying there's never any guarantee of when a Value Pack offer (or any update) will be released. With that out of the way, I'll also say that more often than not, we get one VP per 15 Day Goal - though there are the rare times when we do not get any during a goal.
Past offers have mostly shown up during the second week of the 15 Day Goal so if we do get an offer this time, I would expect it to show up at the end of the week on Thursday or Friday.
Again, this is all speculation based on past behavior and since s8 has a firm policy of not sharing info on future releases, we can never be absolute.