First, note that dual intent is allowed. That is, it is possible to apply for a work/study permit or visitor visa while your PR application is in process and an officer can not use it as a reason to refuse an application. The only difference is, you still need to satisfy the officer(in the case of the work/study permit or visitor visa) that you will leave Canada at the end of your authorized stay. Ofcourse, you can apply to extend it but you don`t need to tell them.
If the officer asks you about your PR application and whether you plan to settle in Canada, you can say that your wife has submitted the application and if it is approved, you will settle in Canada. But that you have a work permit for now, which you will use to work and you understand the conditions that come with it(make sure you do in case the officer asks for an example) and intend to follow the rules.