Hi,
I believe you are doing paper based application
>> How long should i expect for the bg check and all stuffs till PPR?
This is the same question that everyone asks once they submit the documents. Unfortunately noone in this world can give a correct answer for this. Only thing which we can do is to check whether other people who submitted along with you got PPR or not. The best way to check is through tracker.
Here is the link
https://myimmitracker.com/en/ca/trackers/pnp-paper-based-pr-applications-tracker
>> I dont want to apply for WP and VISA extension because i afraid this will cause a delay to the process of my PR
Since you have the AOR you will be able to extend work permit now. You are a BC PNP nominated person. So you have to work in that job till you get PR. If the work permit is expired you cannot work in that job anymore and that can affect PR. So my suggestion is that to apply for extending work permit. I dont think that will delay the process of PR. You can talk to your agent regarding this.
>> My agent told me that it usually take 3months after MEDICAL EXAM PASSED.
Earlier it was like this. but the things got changed now. now you have to wait so lonnnnnnnnng.
Thanks