function custom_sold_out_button_text( $text, $product ) {
    if ( ! $product instanceof WC_Product ) {
        return $text;
    }
    $type = $product->get_type();
    // Keep default text for variable products and variations
    if ( $type === 'variable' || $type === 'variation' ) {
        return $text;
    }
    // For all other product types, if it's out of stock, label it as "Sold Out"
    if ( ! $product->is_in_stock() ) {
        return __( 'Sold Out', 'woocommerce' );
    }
    // Otherwise, keep the default text
    return $text;
}

add_filter( 'woocommerce_product_add_to_cart_text', 'custom_sold_out_button_text', 10, 2 );<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="https://staging.peli.com.my/wp-sitemap-index.xsl" ?>
<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"><sitemap><loc>https://staging.peli.com.my/wp-sitemap-posts-page-1.xml</loc></sitemap><sitemap><loc>https://staging.peli.com.my/wp-sitemap-posts-product-1.xml</loc></sitemap><sitemap><loc>https://staging.peli.com.my/wp-sitemap-taxonomies-product_brand-1.xml</loc></sitemap><sitemap><loc>https://staging.peli.com.my/wp-sitemap-taxonomies-product_cat-1.xml</loc></sitemap><sitemap><loc>https://staging.peli.com.my/wp-sitemap-taxonomies-product_tag-1.xml</loc></sitemap><sitemap><loc>https://staging.peli.com.my/wp-sitemap-users-1.xml</loc></sitemap></sitemapindex>