Yes you can apply for BOWP. attach email with file number, select open work permit when asked what type of work permit you are applying for in the form. You cannot get BOWP from border as far as I know. 78 days currently.
Make sure you meet these 4 criteria
- currently be in Canada,
- have valid status on a work permit that is due to expire within four months,
- select “Open Work Permit” as the type of work permit when you complete your work permit application, and
- pay the work permit processing fee and the Open Work Permit Holder fee.
When you submit your application, you must provide all supporting documents listed in your document checklist. You must also include a copy of your
Acknowledgment of Receipt letter. (Email you got with file number, your PNP certificate - attach it to Letter of Explanation slot if you are applying online)
Hope this helps.