You can review all the issues and task progress under the fallowing URL:
https://github.com/PrestaShop/PrestaShop/projects/16
Product class:
https://github.com/PrestaShop/PrestaShop/blob/1.7.7.x/classes/Product.php
Import products from an XML to PrestaShop a quick overview:
https://stackoverflow.com/questions/58996401/import-xml-products-to-prestashop-in-php/67941265#67941265