In my admin hooks I have $this->loader->add_action( 'admin_init', $plugin_admin, 'options_update' );

And the functions I user:

public function validate($input) {

    $options = get_option( $this->plugin_name );

    $options['some_option'] = ( isset( $input['some_option'] ) && ! empty( $input['some_option'] ) ) ? 1 : 0;

    return $options;

}

public function options_update() {

    register_setting( $this->plugin_name, $this->plugin_name, array(
        'sanitize_callback' => array( $this, 'validate' ),
    ) );

}

I want to display a success notice when it saved correctly with

$class = 'notice notice-success is-dismissible';
$message = __( 'Settings saved.', $this->plugin_name );

printf( '<div class="%1$s"><p>%2$s</p></div>', esc_attr( $class ), esc_html( $message ) );

What do I need to adjust in my code to achieve that?