Create a universal file from two single-architecture files

lipo

Tool for handling Mach-O Universal Binaries.
More information: <https://ss64.com/osx/lipo.html>.
Trick copyright: tl;dr; <https://github.com/tldr-pages/tldr>

lipo {{path/to/binary.x86_64}} {{path/to/binary.arm64e}} -create -output {{path/to/binary}}

click the source code to copy