syncronize number of search results

At the moment I display the number of posts in each category by this code:

function custom_add_count_on_archive_title( $title ) {
 $term = get_queried_object();
 if( $term instanceof WP_Term && 'category' === $term->taxonomy ) {
  $title .= ' <span>'.$term->count.'</span>';
 }
 return $title;
}
add_filter( 'get_the_archive_title', 'custom_add_count_on_archive_title', 10, 1 );

How can I change this posts number according to the real search results number?

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