You are not alone. My GCMS also shows PS. Usually after your medical is cleared it goes to PS. After which I expect it to be a file transfer to Ottawa. FYI mine changed to PS on 23rd March and as per my 10th May GCMS my file was still in PS.
I'm a inland March/2016 applicant and just received my GCMS notes.
The last update was on 26Apr2017 where the location changed to PS -. Does anyone know what it means?
Also, the last thing missing is the Security which is still not started.
Thanks in advance!!