Would a product launch that is added new features be considered at the late stage of the product growth cycle?

I would say this is not necessarily always the case. Adding new features can happen at any stage of the product lifecycle. It could be part of the early stage strategy to iterate or improve the product based on initial customer feedback, or a mid-stage effort to expand functionality and capture a broader target audience. If the product is in it's late stages, new features could be added to help retain existing customers. At Zendesk, we continuously deliver new features within our products to enhance value - regardless of the product's lifecycle stage.