Has the iPhone SE lost support for iOS 11? If not, when approximately will it lose support?

Has the iPhone SE lost support for iOS 11? If not, when approximately will it lose support? - 1

Not it hasn't lost support, the most recent one that has lost support is the iPhone 5. There's still the iPhone 5S and iPhone 6 before the iPhone SE loses support. It'll be at least 2 years before it no longer gets the latest version of iOS

No it hasn't. Since it is basically a 6s in a different body it would lose support for updates when the 6s does.

The 2018 iPhone to lose support would be the 5s, 6 in 2019 & 6s/SE in 2020. (Assuming Apple keeps up its trends as far as that is concerned)