Google Chrome still has the lion’s share so consider that for SEO of course but don’t ignore the millions that use other browsers. And, separately, if you are concerned about trackers and privacy then consider Firefox with the DuckDuckGo extension. That’s a good set up.

Market share: Take your pick but trend is similar
https://gs.statcounter.com/browser-market-share
https://kinsta.com/browser-market-share/