get_queried_object();
// get the thumbnail id using the queried category term_id
// $thumbnail_id = get_term_meta($cat->term_id, 'thumbnail_id', true);
// get the image URL
$image = wp_get_attachment_url($thumbnail_id);
// $mobile_img = kama_thumb_src('w=600 &crop=center', $image);;
?>