I suggest you include significantly more detail than that. Explain specifically about your job search, what you are looking for, how you are looking, what efforts you have made so far, how much you expect to make. Include the same information for your spouse. Also include what she plans to do after she comes to Canada. Are you planning to move out on your own before your wife gets here or will you both be staying with your sister? Does her letter state? You need to fully explain your plan on how you will support yourself and your spouse.