Can’t add image on storefront theme Homepage with my child theme

I try to put a Presentation image on my ecommerce web page by follow the instructions of a Woocommerce Course, the Course tell me to use a hook that exist on the homepage template on this way:

<?php
            /**
             * Functions hooked in to homepage action
             *
             * @hooked storefront_homepage_content      - 10
             * @hooked storefront_product_categories    - 20
             * @hooked storefront_recent_products       - 30
             * @hooked storefront_featured_products     - 40
             * @hooked storefront_popular_products      - 50
             * @hooked storefront_on_sale_products      - 60
             * @hooked storefront_best_selling_products - 70
             */
            do_action( 'homepage' );
            ?>

So I created a Function on my functions.php from my child theme and adding to the hook with add_actin like that:

//Add Image to the HomePage
function coupon_image() {
    
    $img = '<div class="coupon">';
    $img .= '<img src="' . get_stylesheet_directory_uri() . '/img/Logo.jpg">';
    $img .= '</div>';
    echo $img;
}
add_action('homepage', 'coupon_image', 5);

But the HTML elements are not displayed at all on my homepage, what I do wrong? Even if I do the thing more simple like that:

function coupon_image() {
        echo 'Hello';
    }

Still doesn’t display nothing on my main page.