You only need to check one address for each cabinet until it is enabled. When it is you can check more if you want to know speeds.
Fibre rollouts don't work like that.
I originally use to do it that way but sadly found out that the one address that I was checking for a set cabinet never ended up with fibre even though nearly the rest of the road did, I have seen happen loads of times now that not all homes get given fibre even though their cabinet goes live, its the same with FTTP not everyone will get it even though they are using the same PCP Cabinet.
Which is why I check all addresses for my exchange, and now like I said only just under 14K address left to get fibre which only takes me about half a day to check, but I spread it out over a few days, cannot have BT moaning at me
All I do is click on GO and away it goes

and I can just leave it going while I am doing other stuff.
Paul