Latest version number
There is no official indication of the latest version number (cf. PS https://helpx.adobe.com/uk/photoshop/kb/uptodate.html). Please post this information.
Kenneth Kawamoto commented
Yes more specific, as you’d release several versions while XD is in v20. Photoshop states the minor version in the web page above (although it currently says 20.0.4 - it should be 20.0.5!)