No, there is no place where you could find a timeline for the Harmony features that are not implemented yet. As with most software engineering tasks, it's difficult to predict how long things will take. Also, for legal reasons, we try to avoid commenting on events that will take place in the future.
But these do not claim to constitute a complete or accurate list of the remaining work, and they do not have planned completion dates. (Their status may also be out of date; the bug tracker is a development tool, not an official statement.)