Cron Product Sync is not working

Hello,
my issue is with the plugin W2S (Woocommerce to shopify)
I have created a product and then send it to Shopify.
The product was sent correctly.
After that I modified the price and the stock of the product.
I have set up a cron job, but it does not work.
To sync it I have to do the job manually.
Is there any solution for this?
How can I verify it has been updated?
Is there any log file telling it has update?
It is not showing any success or failure status?
How do I know the CRON job has updated the products ?