If you are asking about PR card, yes, you do not need the actual PR card to return to Canada via the land border in private car. You can use a print out of the eCOPR (and CBSA should have your record as well on their system that you are a PR),
I am not sure what kind of document you need for your job. But likely you will need an updated SIN and you don't need your PR card to get a permanent SIN.
Once you get the eCOPR, you are a PR of Canada and you do not need a work visa in order to work in Canada.