So much misinformation regarding WP in this thread, you can apply for WP as soon as you recieve PR application fee receipt. I applied for WP 5 minutes after I applied for my PR and received my WP for 2 years within 100 days, before AOR.
Also poster who said no need to apply for WP as it takes a longgg time and sometimes as much as PR itself, well good luck with employment opportunities. Some employers explicitly ask when is your status expiring plus you need a valid SP/WP for medical benefits at least in BC. They temporarily extend it for few months when you are on implied/processing status but never take a risk on this.