I'm curious to see what Sunday's ratings were. Here are those from week 9. The Argos-Stamps game did not draw so well.

2023 Week 9 TV ratings:

Thursday
B.C. at Winnipeg — 546,700

Friday
Toronto at Calgary — 448,000

Saturday
Montreal at Hamilton — TSN 478,200 and RDS 142,100 (620,300 total)

Sunday
Ottawa at Saskatchewan — 629,700

Total Week 9 average: 525,650 (French included: 561,175)

https://3downnation.com/2023/08/09/august-long-weekend-helps-cfl-record-best-sunday-night-english-tv-ratings-so-far-in-2023/

And just for fun, here are last year's Week 9 ratings:
2022 Week 9 TV ratings:
Thursday
Winnipeg at Montreal — 475,600
Friday
Calgary at Ottawa — 337,300
Saturday
Hamilton at Toronto — 378,800
Edmonton at B.C. — 499,000
Total Week 9 average: 422,675