With those predictions I can’t see why he would be on hold! They’re great!
DS got his form in in late October and got acknowledgements quite quickly and his first 4 offers were between 10 and 20 days. Manchester was later, just after his interview. It may be that my DS beat the ‘rush’ of applications and yours is in the thick of them. He may now not hear until after Christmas, frustratingly.
I think on MN our DC are generally much quicker than average getting their forms in. Self selected overly invested parents!
So no need to worry yet. I’m sure he’ll have some offers through soon with those predicted grades.