Welcome to SR, Martin; very glad you found us.
Congratulations on ten sober days; well done.
I didn't tell anyone when I began my sober journey but the focus of my life at that time so I didn't have many occasions to bring it up or explain my soda water.
It was probably a year before I had a frank conversation with anyone and even then (and now) I am very selective with whom I share the information.
It's up to you if and with whom you share. Many people (including me) believe that the disclosure and conversation should stay out of the workplace.
Again, welcome Martin.