Thanks Leon. Knowing this has put my mind at ease. We all have work commitments or others to complete that require time to do before the big move to Canada. Have you encountered this situation yourself? How long can you put the card on hold?
If you don't want to have to apply for it and wait for months and have to pick it up, you can put it on hold for up to 6 months.
Once you come back to Canada to stay and inform immigration that you now have an address, if it is less than 6 months since you landed, they will mail the PR card to you same as for any new PR. It currently takes 37 business days or about 7 weeks, see
http://www.cic.gc.ca/english/information/times/perm-card.asp If it is more than 6 months, you have lost your chance at the first free PR card and so you will have to fill out an application, see
http://www.cic.gc.ca/english/information/applications/prcard.asp, pay $50, get new photos and apply to get a PR card. This application will then go the same route as a PR card renewal, the processing time is much longer, about 5 months now and you will have to pick this card up in person at the local CIC office where you live when it is ready. This you can do as long as you still meet the residency requirements, that is as long as you have not spent 1095 days or more outside Canada since you landed as a PR.