Jetpack is not necessary for you to run WooCommerce. You can run a WooCommerce store without ever installing Jetpack on your site.
It is a plugin that WooCommerce do recommend, but it is never mandatory to use.
But if you have plans to use WooCommerce Services, then you do need Jetpack. WooCommerce Services needs Jetpack in order to work – but it’s important to note that WooCommerce Services and WooCommerce are two separate plugins.