This archives the necessary folders such as /Content, /Config, /Source (if it exists), and the .uproject. Place it in the root of your UE project and run it. The .zip will be in the same place.
Use this command if you're doing C++ scripting stuff: UnrealBuildTool.exe -projectfiles -project="C:\FULL_PATH_TO_YOUR\UNREAL_PROJECT.uproject" -game -engine -progress
Note, be sure to add C:\Program Files\Epic Games\UE_5.3\Engine\Binaries\DotNET\UnrealBuildTool to your environment variables.