Here is the rankings of all the CW Premieres
 
Live +3 and Live +7 daty Ratings
 
  Live Ratings (Overnights) Final Same Day Live +3 Day Live +7 Day
18-49 0.4 0.36 0.58  0.62
Total Viewers 1.34 1.226 1.795  1.954
 
More ratings below the cut.
Show Live +SD 18-49 Live +SD Total
Flash 0.6 1.622
Supergirl 0.5 1.86
Batwoman 0.5 1.263
Supernatural 0.4 1.225
Riverdale 0.4 1.14
Nancy Drew 0.3 1.175
Legacies 0.3 0.799
All American 0.3 0.884
Black Lightning 0.3 0.891
Charmed 0.2 0.649
Dynasty 0.1 0.45
 
We have the overnight ratings for the premiere episode of season 15 of Supernatural.
 
Overnight ratings from Showbuzz Daily.
 
Programming Insider reports The CW Matches CBS and NBC Among Adults 18-34 with "Supernatural" and "Legacies" Season Premieres Pretty impressive that we are matching ratings from major networks in an important demographic.
 
Supernatural did not make the weekly top ten in the Nielsen Social ratings, but Misha Collins did make the list in Top Ten Talent. The ch.arts are here
 15.01 Nielsen Talent
 
 
 
For Premier week we are the 4th highest rated show coming after Flash, Supergirl and Batwoman.