They are dealing with March and April 2018 files .. ie files that were sent to ndvo in March or April.
Mine was sent to ndvo April 2018 end and I got Pre arrival in mail on dec10 2018
Hope that helps
Hi .. my timeline is pretty much closer. I am in Canada and sponsored my wife
App recieved - April 10
Medical request - June 05
File Transfer to NDVO - July 28
I am still waiting for updates