Spouses of PR and citizens often have a very difficult time getting approved for a TRV unless they have very strong proof that they have no intention of remaining in Canada and they are only coming for a temporary visit. When applying for a spouse as non-accompanying spouses often will need to remain separated while they wait for sponsorship. Depending on where you are located TRV processing can be quite long as well. I hope you do get approved for the TRV but I would not delay starting the sponsorship process.