BOWP is done on a FIFO base, so there is no timeline for that. As soon as the officer opens the file, s/he decides to send you ADR, approval, or rejection immediately.
For the processing time, check the following link
https://www.canada.ca/en/immigratio...vices/application/check-processing-times.html
Check the work permit extension (same employer) or (new employer) - They are the same
As of now, their last update was on March 31st, where they were working on the files that they received on Dec. 31 and the processing time was 89 days.