Sometimes you may need to change woocommerce's mini-cart 'Subtotal' text. Take a look below
You can change that "Subtotal" text by using woocommerce woocommerce_widget_shopping_cart_subtotal() function. Here is an example.
Write this piece of code inside your theme/child theme's functions.php file and see the change.
As this "Subtotal" text comes from woocommerce so you will see this change on our product table's mini-cart also.