add_action('woocommerce_single_product_summary', 'display_specific_shipping_class', 15 );
function display_specific_shipping_class(){
    global $product;

    // HERE define your targeted shipping class name
    $defined_shipping_class = "Estimated Delivery in 7-15 days";

    $product_shipping_class = $product->get_shipping_class();

    // Get the product shipping class term name
    $term_name = get_term_by( 'slug', $product_shipping_class, 'product_shipping_class' );

    if( $term_name == $defined_shipping_class ){
        echo '
' . $term_name . '
';
    }
}