The LTE versions of the Galaxy Watch and the Watch Active 2 are perfect for that. For the LTE version of the watch, it requires you to sign-up for a separate data plan however so you will no have to take your phone with you when you go for a workout. Plus the Galaxy Watches can store songs in them while go go for a run. However you wouldn't be able to exclusively connect the Galaxy Watch to your Galaxy Buds.
To add on to this: the reason being is because everything is done through the Galaxy Wear app which is needed to be installed on your phone for both the watch and the galaxy buds to be connected to your phone.