I gave you the code above for getting the term id.
For terms acf uses a constructed post id that is
when you get_terms(), you already know the name of the taxonomy. In you’re case, according to your code the taxonomy is product_cat. When you loop through the fields the term id is in $product_category->term_id
So you can get the value of the field using the_field('field_name', 'product_cat_'.$product_category->term_id);
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