You can override the email template from WooCommerce > Settings > Email section and fetch the delivery date and time using the meta key and customize it as per your requirement.

After Overriding the email template, try the below code:

add_filter('orddd_add_delivery_info_on_top_of_order_table', 'orddd_add_delivery_info_on_top_of_order_table' );
function orddd_add_delivery_info_on_top_of_order_table( $bool ) {
   return true;
}