How to tell if dmg file contains universal binaries, i.e. if it has been compiled for arm64 hardware

Can you tell from a .dmg file if it contains arm64 binaries? I've got a Mac mini M1 running Big Sur. I don't want to run apps under Intel, only arm64. I don't even have Rosetta installed, and want to avoid installing it. I can install apps, try to run them, and see if they request Rosetta installation. But I'd like to know if the .dmg file contains binaries compiled for arm64 without running the application.