Apple recently updated features page iOS 15, indicating that Find My network support for AirPods Pro and AirPods Max has been delayed until "later this fall" meaning the feature will not be available in the first release of iOS 15.
If you lose your AirPods Pro or AirPods Max and someone else with an iPhone, iPad or Mac approaches them, Find My Network can safely and confidentially tell you the approximate location of the headphones. The feature is designed to help you get within Bluetooth range of the AirPods so you can play audio and locate them.
Apple didn't provide a reason for the delay, but some other iOS 15 features like SharePlay, Legacy Contacts, the ability to add a driver's license or state ID to the Wallet app and others won't be available until later this year either. Last month, Apple also marked the iCloud Private Relay feature as beta.
iOS 15 will be released today, after more than three months of beta testing. The update is compatible with the same iPhone models as iOS 14, including older devices such as the iPhone SE and iPhone 6s. iPadOS 15, watchOS 8 and tvOS 15 will also be released today, while a macOS Monterey release date has not yet been announced.
Source: apple, macrumors