Average processing time is 12 months. In your case, that would mean May 2019. Recently they've been doing it a bit faster so some people finish at around the 10 month mark, but it's still definitely too early for you.
Applying for a visitor visa will not affect your PR application in any way, but it's generally difficult to get one in your situation as having a spouse in Canada and a PR application in process makes you an overstay risk. So make sure you have strong ties to your country to make chances of getting the visitor visa better.
what does it mean to have strong ties in my country?