iPhone 13 series is expected to include four models —iPhone 13, iPhone 13 Pro, iPhone 13 Pro Max, and iPhone 13 mini. As per a report, media invites are expected on September 7 with a launch event likely to be scheduled for September 14. Pre-orders are reported to begin on September 17 with sale anticipated to begin on September 24.

source https://gadgets.ndtv.com/mobiles/news/iphone-13-launch-mini-pro-max-series-date-pre-order-timeline-leak-september-14-17-24-2520270#rss-gadgets-all