I am trying to print all products of a brand on a taxonomy page.

I find the wp_querry but i cant print the current brand name of the brand to show all products in this page.

What to put on terms array to print the current page brand name? 

    // get products
    $args = array(
      'post_type'      => 'product',
      'posts_per_page' => -1,
      'tax_query'      => array(
          array(
              'taxonomy' => 'pwb-brand',
              'field'    => 'name',
              'terms'    => array ('NAME?????')
            )
        )
    );
    $loop = new WP_Query( $args );
    if ( $loop->have_posts() ) {
        while ( $loop->have_posts() ) : $loop->the_post();
            wc_get_template_part( 'content', 'product' );
        endwhile;
    } else {
        echo __( 'not found anyhting.' );
    }
    wp_reset_postdata();