You can use the entity-history function (and write a helper function to assoc tx/valid time into the entity for sorting) but there's no way (yet) to get that information just from a query

You can however embed those entity-history functions inside a query (which is reasonably efficient) see https://gist.github.com/refset/8439ceebf3c1f08c614b0c818266a140 (and then apply a Datalog order-by - which in turn may not be that efficient, depending on the size of the result set)

This is generally the better option if you require access to the data for fast & flexible querying (in the current version of XT, at least 🙂)