Getting a job offer unfortunately won't make any difference to how quickly your application is assessed I'm afraid. It will already be in the managed queue, along with over 7,000 other SMC applications, waiting for it's turn to be allocated to an Immigration Officer for assessment (based on whatever criteria INZ choose to allocate at the time). If you happen to get a job offer, send details of it to INZ via courier and it will be added to your application file, but this won't change how quickly your application gets allocated (unless the job is paying above the high remuneration threshold, is for a government department or you have occupational registration in NZ to do the job).