Read More Button For Excerpt in the Blog post archive page

//Read More Button For Excerpt in the Blog post archive page template or HomePage
function themeprefix_excerpt_read_more_link( $output ) {
    global $post;
    return $output . ' <a href="' . get_permalink( $post->ID ) . '" class="more-link" title="Read More">Read More</a>';
}
add_filter( 'the_excerpt', 'themeprefix_excerpt_read_more_link' );