I am an external candidate and applied in the April/May recruitment window and was notified I'd passed the application stage in early June. I attended the Assessment Centre in early July and am awaiting results. I did have an email last week saying that due to unforeseen circumstances the results would be delayed so I have no idea when these will be.
I'm not sure why you haven't been notified yet, maybe it would be best to ring recruitment and check. No news may be good news as there may be some more Assessment Centre dates coming soon and they're just waiting to notify you that you've passed nearer the time. Good luck with it anyway.