For any other TV ratings there is a thread in the Other Sports and Entertainment section.
A bit of a struggle to start. These are TSN ratings taken from 3DownNation through the first four weeks and do not include any RDS numbers
Week One - the four games averaged 523,400 down 10% from Week One 2018
Week Two - the four games averaged 409,000 down 16% from Week 2 last year
Week Three - the four games averaged 529,000 - with a boost from the 764,000 post-lightning delay on Canada Day for Argos @ Riders. Before the delay the telecast had been averaging 502,600 for an overall average for that game of 633,700.
Week Four - the four games averaged 511,175. The great - 722,000 for Stamps - Riders. The good - 545,200 for Bombers - Redblacks. The not so good - 399,000 for Cats @ Als (I would assume 500,000+ once RDS numbers were included). The ugly - the Lions - Argos game - 378,500.
Overall through four weeks the TSN average is 493,362. That is down from 524,462 through 4 weeks of 2018 but is fairly close to the 498,312 through 4 weeks in 2017.