I hope my answer is not too late, unfortunately the Samsung Watch is not supported.
Unfortunately, I had to experience this myself at home.

However, the Buds and the smartphone can be charged without any problems.

I would also be interested to know if the charger has been tested with the Galaxy Watch (Active 2 in my case) as it does not work with normal Qi chargers...

i only have Apple products and there it charges 2 iPhone X and 1 Apple Watch S4 at the same time. simply perfect solution.
the watch holder is magnetic.
According to the description, the Samsung phone should also be charged, but whether the Samsung watch also works, I can unfortunately not say. You'll have to try it out on the off-chance (I didn't find anything on the net in the short time available).