Probably. Go to developer.apple.com. You want to download Xcode and install the iOS SDK through XCode. You may need to make (free tier) Apple Developer Account before it lets you download.
Note that you can’t install apps from the iOS App Store on the iOS simulator; only a handful of system apps and anything you build for the simulator yourself.
Apple provides an iPhone emulator as part of their official SDK. Free to download, but only runs on Mac.
No they don’t.
Would it run on my macOS 11 VM?
Probably. Go to developer.apple.com. You want to download Xcode and install the iOS SDK through XCode. You may need to make (free tier) Apple Developer Account before it lets you download.
Note that you can’t install apps from the iOS App Store on the iOS simulator; only a handful of system apps and anything you build for the simulator yourself.