Check the installed WooCommerce version, and compare it to the latest version available on WordPress.org. If the installed version is older, it will print "Newer Version Available." If the installed version is the same or WooCommerce is not found, it will print an appropriate message.

latest-woocommerce-version.php

<?php

/////////////////////////////////////////////////////////////////////////////////////////////////////
/// Run the following command in SSH to install the dependency (i.e. "fabpot/goutte"): //////////////
/// composer require fabpot/goutte //////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////////////////////////
/// 1. Get the latest version of the WooCommerce plugin from the WordPress.org plugin repository. ///
/// 2. Check a list of websites for the installed version of the WooCommerce plugin. ////////////////
/// 3. Compare the installed version with the latest version available on WordPress.org. ////////////
/// 4. Output the appropriate message based on the comparison results. //////////////////////////////
/////////////////////////////////////////////////////////////////////////////////////////////////////

require_once 'vendor/autoload.php';

use Goutte\Client;
use GuzzleHttp\Client as GuzzleClient;
use SimpleXMLElement;

function get_latest_woocommerce_version() {
    $url = 'https://api.wordpress.org/plugins/info/1.0/woocommerce';
    $client = new GuzzleClient();
    $response = $client->get($url);
    $xml = new SimpleXMLElement($response->getBody());
    return (string) $xml->version;
}

function get_installed_woocommerce_version($url) {
    $client = new Client();
    try {
        $crawler = $client->request('GET', $url . '/wp-content/plugins/woocommerce/readme.txt');
        $text = $crawler->text();
        preg_match('/Stable tag: (\d+\.\d+\.\d+)/', $text, $matches);
        return isset($matches[1]) ? $matches[1] : null;
    } catch (Exception $e) {
        return null;
    }
}

$latest_version = get_latest_woocommerce_version();
$websites = ['https://example1.com', 'https://example2.com'];

foreach ($websites as $website) {
    $installed_version = get_installed_woocommerce_version($website);

    if ($installed_version !== null && version_compare($installed_version, $latest_version, '<')) {
        echo "Website: {$website} - Newer Version Available.\n";
    } elseif ($installed_version !== null) {
        echo "Website: {$website} - WooCommerce version: {$installed_version}\n";
    } else {
        echo "Website: {$website} - WooCommerce not found or version couldn't be determined\n";
    }
}