16 weeks of FBI
8 weeks of CIC to update spouse app.
1. this will cause delay of almost 6 months in my landing if I want her along, right? Or do you expect more?
Depends. But these are the broad timelines.
2. In case, I choose sponsorship route, will that need similar FBI PCC? and will be 12-16 months from the day we submit documents, right?
Yes. Can be longer than 16 months, depends on country of origin. Check IRCC site for latest timelines.
I am little skeptical in delaying my entry, can we have a plan B-
3. she will be in the US from May-2016 can she make an entry to Canada from there and will that expedite the process by any chance?
She can try applying from the US for any category of visa - that will be processed based on the merits of their application. Simply being in the US doesn't expedite the process.