Taxonomy list with commas

Hey all,

I used the following code from the codex and am having trouble adding a comma to separate the terms. I can add the comma to ‘%2$s’ but then it still shows up on the last item on the list. I’m not sure how to list the terms without the last comma?

Thanks.

function wpdocs_custom_taxonomies_terms_links() {
    // Get post by post ID.
    $post = get_post( $post->ID );
 
    // Get post type by post.
    $post_type = $post->post_type;
 
    // Get post type taxonomies.
    $taxonomies = get_object_taxonomies( $post_type, 'objects' );
 
    $out = array();
 
    foreach ( $taxonomies as $taxonomy_slug => $taxonomy ){
 
        // Get the terms related to post.
        $terms = get_the_terms( $post->ID, $taxonomy_slug );
        
        if ( ! empty( $terms ) ) {
            $out[] = "<strong>" . $taxonomy->label . ":</strong> ";
            foreach ( $terms as $term ) {
                $out[] = sprintf( '%2$s', esc_url( get_term_link( $term->slug, $taxonomy_slug ) ), esc_html( $term->name ));
            }
            $out[] = "<br>";

        }
    }
      echo implode(" ", $out );
}