First, allow me to congratulate your son on receiving two nominations - quite a feat!
As long as the nominations show up in the Candidate Portal, there's no need to worry. In my case, I received a letter from my Congressman about a week and a half before the nomination was displayed on my portal. However, I also know of candidates who received the nomination in their portal before hearing directly from the source, so it can go either way.
To my knowledge, where a nominee stands on the list is usually not disclosed in the letter from the nominating source. There are a few cases I know of where the MOC has contacted the principal nominee to notify him of his status, but everybody else on the slate is virtually in the dark as to how they are ranked.
Again, congratulations to your son on the nominations! Go Army!