Can I get a WhatsApp copy of every order notification on my own phone?

Yes. On Plugins → WhatsApp Notification, in the connection section:

1. Enter your number in Admin WhatsApp Number (Optional).
2. Tick Send a copy to the admin number.
3. Click Save settings.

For every event that is switched on under Order Notifications, your number receives the same template message the customer gets. A number without a country code gets the Default Country Code added. If you only want alerts for some events, untick the others; that also stops them for customers.