Preload SiteOrigin slider font on static home page

function siteorigin_preload_slider_font() {
    if ( is_front_page() ) { ?>
        <link rel="preload" href="<?php echo plugin_dir_url( SOW_BUNDLE_BASE_FILE ); ?>css/slider/fonts/slider.woff" as="font">
    <?php }
}
add_action( 'wp_head', 'siteorigin_preload_slider_font' );