Display "Post Views Counter" in Wordpress - php

Question

I got this snippet of code to display my post views counter in my wordpress website.
function bac_PostViews($post_ID) {
$count_key = 'post_views_count';
$count = get_post_meta($post_ID, $count_key, true);
if($count == ''){
$count = 0;
delete_post_meta($post_ID, $count_key);
add_post_meta($post_ID, $count_key, '0');
return $count . ' Visitas';
}else{
$count++;
update_post_meta($post_ID, $count_key, $count);
if($count == '1'){
return $count . ' Visita';
}
else {
return $count . ' Visitas';
}
}
}
Then, in my 'single.php' file I added this code for retrieving the count:
$blog_number_visits = bac_PostViews(get_the_ID());
And this code for showing the count:
if ( $blog_author || $blog_date || $show_comments_number ) {
$meta .= '<p class="meta">';
if ( $blog_date ) $meta .= esc_html( date_i18n( $date_format, strtotime( get_the_time( 'Y-m-d' ) ) ) );
if ( $blog_date && $blog_author ) $meta .= ' — ';
if ( $blog_author ) $meta .= '<span class="visitas">' . $blog_number_visits . ' </span>';
if ( ( $blog_date || $blog_author ) && $show_comments_number ) $meta .= ' — ';
if ( $show_comments_number ) $meta .= '<span class="commentCount">' . $comments_number . '</span>';
$meta .= '</p>';
}
My problem is that I can't display it in the home page. The HOME is getting the code from functions.php and if I put my snippet of code in functions.php and try to display it from there... It always shows 0 VIEWS.
I think maybe the problem is that functions.php is not inside 'the LOOP' and thats why is not displaying in the home.
My website: Website home where I want to display VIEWS COUNTER