Change Add to Cart Text WooCommerce

custom-add-to-cart-text.php

<?php
// To change add to cart text on single product page
add_filter( 'woocommerce_product_single_add_to_cart_text', 'storemizer_single_add_to_cart_text' ); 
function storemizer_single_add_to_cart_text() {
    return __( 'Buy Now', 'woocommerce' ); 
}

// To change add to cart text on product archives(Collection) page
add_filter( 'woocommerce_product_add_to_cart_text', 'storemizer_product_add_to_cart_text' );  
function storemizer_product_add_to_cart_text() {
    return __( 'Buy Now', 'woocommerce' );
}