It is not advisable to book flight tickets before PPR. Some application take hell a lot of time, without any reason. So, just wait until you get the decision.
I applied from India, even I received the mentioned documents with address of Canada. It is all coz the system is online and is controlled all the way from Canada brother.
You can not really predict.... few are getting the biometric request even after around 20 days. No need to be concerned, it's normal. Just wait and be positive