Apple would not be releasing iPhone mirroring if the latency were terrible. If they had a low bar for latency, they’d have released iPhone mirroring ten years ago. Apple's Human Interface Guidelines do not specify an exact maximum number of milliseconds for interface latency. However, they emphasize the importance of responsiveness and recommend that any user interface should feel instantaneous and fluid to create a positive user experience. The general goal is to keep latency as low as possible to ensure interactions feel immediate and natural.
