The processing timeline to get PR for protected person is 19 months based on CIC
Protected persons and convention refugees (in Canada)
19 months
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application status
This processing time refers to applications for permanent resident status from protected persons and Convention refugees.
For your overseas family it’s different process , their process will start after you get the DM letter and it’ll start that IRCC sending thier applications to visa office and the visa office will start processing thier applications and requesting documents to validate the relationship with you and thier eligibility and background check. From others experience, the average timeline required from VO to finilze the whole process is 4 to 6 months from receiving the requested documents but there are lot of cases delayed because of security check and no one can tell exact timeline so it’s different from case to case.