Duplicate link in admin bar

Thanks mate!

Unfortunately, it didn’t work for me.
So based on your function and my themes (Flatsome) admin edit bar function I re-wrote it:

/**
 * Add «Duplicate this product in
 * admin toolbar
 */

function ross_admin_bar_link() {

 if(is_product()){

        global $wp_admin_bar;
        global $post;

        if ( ! current_user_can( 'edit_post', $post->ID ) ) {
                return;
        }

        $duplicate_url = wp_nonce_url( admin_url( 'edit.php?post_type=product&action=duplicate_product&post=' . $post->ID ), 'woocommerce-duplicate-product_' . $post->ID );

                $wp_admin_bar->add_menu( array(
                        'parent' => 'edit',
                        'id'     => 'wedp_admin_bar_button',
                        'title'  => 'Duplicate this product',
                        'href'   => $duplicate_url,
                                                                'meta' => [

                                                        'target' => '_blank',

                                                        ]
                ) );

}

}

add_action( 'wp_before_admin_bar_render', 'ross_admin_bar_link', 30);

Not sure is it correct syntaxis but works