After reviewing the updated help documentation it appears the new Map Viewer and Dashboard apps did not make it into ArcGIS Enterprise 10.9. If they are not part of 10.9, will those apps be available as a separate installer similar to how ArcGIS Field Maps was for 10.8.1?
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Esri just answered the question about the Map Viewer Beta in a blog post: https://www.esri.com/arcgis-blog/products/arcgis-enterprise/announcements/map-viewer-beta-in-arcgis-...
ArcGIS Enterprise 10.8.1 has the Map Viewer Beta March 2021 edition and ArcGIS Enterprise 10.9 has the Map Viewer Beta December 2020 edition and will not be updated. So the final version of the new Map Viewer found in ArcGIS Online is not available for any version of ArcGIS Enterprise at this time.