Check if wp action-scheduler ("cron") tasks are already running

wp-cli-scheduler.sh

#!/bin/bash
SERVICE="wp-cli action-scheduler"
MAX_RUNNING_SCHEDULERS=3
WP_CLI_PATH="/usr/local/bin/wp"

if (( $(ps aux | grep '/bin/wp action-scheduler' | grep -v 'grep' |  wc -l) >= MAX_RUNNING_SCHEDULERS ))
then
    echo "$SERVICE tasks are running at it's limit ($MAX_RUNNING_SCHEDULERS)."
else
    echo "$SERVICE tasks are NOT running at it's limit ($MAX_RUNNING_SCHEDULERS)."
    echo "$($WP_CLI_PATH run --batch-size=5 --batches=6 2>&1)"
fi