Hit obviously.
Roar and Dark Horse both sold close to 6m in the US alone, had 150m+ streams on Spotify and 600m+ views on VEVO.
Roar became Katy's biggest WW hit and DH became Katy's biggest US hit.
PRISM sold 1.5m in US and 3.4m WW in a year.
And of course, the tour is doing amazing. $150m+ overall gross is guaranteed and might just hit $200m if Katy adds another US/South America leg.
Not to forget she's doing the Superbowl next year.