You need to know how many Altitude Qualifying Dollars you have spent. You get AQD when your bum is on an Air Canada flight (or Air Canada Rouge, or Air Canada express) or your ticket was issued by Air Canada (ticket number starting with 014, aka Air Canada stock)
The best way to determine this is to log into the Altitude website and check. You need to have spent $4,000 for E35K and $6,000 for E50K