Why isn’t iOS 16 showing as an update for my iPad Pro

Unlike iOS16 for iPhone, released 12th September, iPadOS16 is not due for release until 24th October.  For reasons known only to Apple, release dates for iOS for iPhone and iPadOS for iPad have been deliberately staggered.

However, iPadOS 15.7 was also released 12th September - incorporating essential security updates.

About the security content of iOS 15.7 and iPadOS 15.7 - Apple Support

More information about the forthcoming iPadOS16 can be found here:

iPadOS 16 Preview - Apple

When iPadOS16 is released tomorrow, it will be available for these models of iPad:

• iPad Pro (all models)
• iPad Air (3rd generation and later)
• iPad (5th generation and later)
• iPad mini (5th generation and later)

If Apple release updates to their established schedule, anticipate the release occurring at sometime around 5.00pm to 6.00pm GMT/UTC

For your timezone, simply add or subtract the correct number of hours from the Greenwich Meridian - from which all world times are calculated.

https://www.timeanddate.com/worldclock/converter.html

Because it won't be released until October 24, 2022.

Its October 24, 2022 and its still not showing up.

Per history the update appears somewhere between 10:00a - 1:00p Pacific Daylight Time.