Samsung doesn't look as though it will bring a Galaxy S9 Active to market this year. With the typical launch window for the device passed, coupled with the relatively weak demand for the S9 line generally, it seems as though the Active variant may have quietly slipped off the radar.
https://www.notebookcheck.net/Samsung-Galaxy-S9-Active-seems-to-have-quietly-dropped-off-the-radar.323784.0.html