It’s never worked like that in reality. Some clients always get stuff before others. Though we try each app has different things to take care of and hurdles to overcome. The mobile apps are the ones most folks listen to music on so they were implemented first.
I’m sorry there is no ETA but this will get updated as more apps get support Plex Apps that Support TIDAL and the Roku release notes will have it there when it happens as well Plex for Roku