When exactly should one report "localiser established"?
If you are "cleared for the approach" there is no need to make additional radio calls.
However on a recent flight I was told that is a "fail" because one is not fully established.
It just sounds like someone is being pedantic. Are they "failing" you to make you redo something to make money out of you?
Within 3/4 scale deflection should be all you need initially getting down to 1/2 at the DA point.