protected $_session;
protected $_context;

public function __construct(
    MagentoCustomerModelSession $session,
    MagentoFrameworkViewElementTemplateContext $context
) {
    parent::__construct($context);
    $this->objectManager = $context->getObjectManager();
}


public function isCustomerLoggedIn()
{
    $session = $this->objectManager->get('MagentoCustomerModelSession');
    if($session->isLoggedIn()) {
       status = "Customer logged in";
    }else{
        status = "Not customer logged in";
    }
    return status;
}