If iOS is anything like macOS, they have already quietly rolled it out.
If you're on a mac, even "Big Sur", check to see if the CSAM weights file is here at:
/System/Library/Frameworks/Vision.framework/Resources/NeuralHashv3b-current.espresso.weights
If you use un-jailbroken iOS 14 of course you can't easily check for the presence of the weights file, so you're already trusting Apple on their word.
If you're on a mac, even "Big Sur", check to see if the CSAM weights file is here at: /System/Library/Frameworks/Vision.framework/Resources/NeuralHashv3b-current.espresso.weights
If you use un-jailbroken iOS 14 of course you can't easily check for the presence of the weights file, so you're already trusting Apple on their word.