Magento 2.3 Multi-Source Inventory Module – Does it Work for the Products Provided?

Magento 2.3 Multi-Source Inventory Module – Does it Work for the Products Provided?

The MSI roadmap indicates that it is in milestone 3. So, if I implement today the MSI module in a catalog of simple and supplied products, will not it allow that the products supplied are compatible? Seems to have a hard time getting it shipped.
https://github.com/magento-engcom/msi/wiki/MSI-Roadmap#mls3