as per CIC website...
To be eligible for a BOWP, foreign nationals must
•be currently in Canada;
• have valid status on a work permit that is due to expire within the next four months;
•be the principal applicant on an APR under the FSWC, the CEC, the FSTC, the PNC (see note below), or one of the two caregiver classes;
•have completed one of the following APR stages: ◦their electronic application for permanent residence (e‑APR) submitted under Express Entry has passed the R10 completeness check; or
◦they have received a positive eligibility assessment on their paper APR submitted by mail under one of the economic classes above;
•have applied for an open work permit;
•have paid the work permit processing fee and the open work permit holder fee; and
•have provided, as applicable, evidence (e.g., nomination certificate) that their provincial nomination is unrestricted.