How to determine if a MacOS program on Apple Silicon is emulated x86 or native ARM from the command line?
Run file on a binary:
krismatth@KristophersMBP3 ~$ file /bin/bash
/bin/bash: Mach-O universal binary with 2 architectures: [x86_64:Mach-O 64-bit executable x86_64] [arm64e:Mach-O 64-bit executable arm64e]
/bin/bash (for architecture x86_64):    Mach-O 64-bit executable x86_64
/bin/bash (for architecture arm64e):    Mach-O 64-bit executable arm64e

Activity Monitor shows the architecture of running programs: