But if the CSSE doesn't give us a ranking (I'm still hoping they will, but I've no evidence that they will)
I don't think a ranking would be of any more help to you anyway unless your child is ranked very high, as they would only be able to rank all candidates in one list (as applications haven't been made.)
Being told your DS is eg, rank 300 is not going to mean anything unless you are in the position to accept any grammar place in the county. For those of us in North Essex for whom Colchester is the only option unless we rank in the top 96 there would still be no guarantee as all the candidates above us may want the same school.
I hope I am wrong but I am not convinced that the results are going to be particularly helpful unless DC has done either brilliantly or failed miserably. And with the later I presume we would still need to apply for the preferred grammar if we are considering any form of appeal so it still won't make any difference to our CAF choices.