If you have informed OINP then you wait. They may a) give you an amount of time to find a job with the same NOC and PR application is put on hold, b) cancel nomination and inform IRCC to cancel PR, c) not cancel nomination and let you get PR. In the meantime, try and find a job in the same NOC. If you get letter from OINP cancelling nomination then will be given a timeframe to find an equivalent job. May want to retain a lawyer.