If you own an Apple product and still waiting for the today update to iOS11. It will happen at 10 a.m PT Pacific Time is about ONE HOUR and 20 minutes left at this time.
iPhone 7, iPhone 7 Plus, iPhone 6s, iPhone 6s Plus, iPhone 6, iPhone 6 Plus, iPhone 5s, iPhone SE, iPad Pro 9.7, iPad Pro 10.5, iPad Pro 12.9, iPad 9.7, iPad Air 2, iPad Air, iPad mini 4, iPad mini 3, iPad mini 2 and the iPod Touch (6th gen). The new iPhone 8, iPhone 8 Plus and the iPhone X are coming with the OS straight out of the box. Source: Apple
The only iOS 10 devices that are not getting the upgrade are the iPad 4 and the iPhone 5, along with the iPhone 5c.
What is coming with iOS11 you can read on Apple , and how to get ready for the update here on Support Apple