Unused var if needed in future we can use WC_PLUGIN_BASENAME constant

includes/admin/class-wc-admin-welcome.php

@@ -21,14 +21,10 @@ if ( ! defined( 'ABSPATH' ) ) {
  */
 class WC_Admin_Welcome {
 
-	private $plugin;
-
 	/**
 	 * Hook in tabs.
 	 */
 	public function __construct() {
-		$this->plugin             = 'woocommerce/woocommerce.php';
-
 		add_action( 'admin_menu', array( $this, 'admin_menus') );
 		add_action( 'admin_head', array( $this, 'admin_head' ) );
 		add_action( 'admin_init', array( $this, 'welcome'    ) );