How to show selected check box vendors on front end home page?

ACF is a third-party plugin and I don’t know what functions it gives you that you could use.

In general, though, you can create a query for posts with a particular custom field and value.

$args = array(
    'meta_key'   => 'featured', // must match the key that ACF has used
    'meta_value' => true, // must match the value that ACF has used
    'post_type' => 'product' // must match your post type
);
$the_query = new WP_Query( $args );

Then just run through a secondary loop as normal:

if ( $the_query->have_posts() ) {

    while ( $the_query->have_posts() ) {
        $the_query->the_post();

        // output html for each post here

    }

    /* Restore original Post Data */
    wp_reset_postdata();
} else {
    // no posts found
}

Depending on what you want you could put this into your front-page.php template, hook it into the_content or turn it into a shortcode.