[Joker_vD]

Looks interesting; my klunky script for doing something similar has been something along the lines of

    printf 'started: %s\n' "$(utcdate)"

    (
        trap 'kill 0' SIGINT
        for REMOTE in "${REMOTES[@]}"
        do
            ssh -- "$REMOTE" "$COMMAND" "$@" &
        done
        wait
    )

    printf 'ended: %s\n' "$(utcdate)"

but twiddling with it has been quite annoying, so I'll look into this tool.