https://techcrunch.com/2019/09/19/ios-13-is-now-available-to-download/

Apple has just released the final version of iOS 13. This update brings many much needed quality-of-life improvements — and there are also a bunch of new features. The update is currently rolling out and is available both over-the-air in the Settings app, and by plugging your device into iTunes for a wired update.

Many people try to download these major updates at the same time. Apple usually implements a queue system to ensure speedy downloads once you’re at the front of the queue.