Arrakis, re how far in advance the controller was telling things to the plane. No idea, but someone in the forum there pointed out usually they do tell in advance, so by the time one says the other hears - the plane is where it is said to be.
We've got an example in the record:
10:39:49.9 - 10:39:52.3 Controller: You're coming to the Far, on course, on glideslope, distance 6.
10:39:50.2 - 10:39:58.0 Sound signal, frequency 845 Hz, Far Beacon.
The man who commented on controller work said it's good, he told them where they are and right after was the beep in the cabin proving where they are.
Either ground control gets a signal when a plane enters the Far Beacon zone? Or it can define the plane's position quite exact on his screen.