Not that many people use real computers any more. At work, you may need to use a computer, but you probably can’t change the browser. At home, you have the PCMR folks who use a computer and probably also care about browsers. Everyone else just uses a tablet or a phone for browsing the web.
Speaking of the web, most people interact with specific websites through an app and an API, so they don’t even launch the mobile browser until they have to visit a site that doesn’t have an app. The world has changed and browsers aren’t as relevant as they used to be.
I don’t have numbers that would directly address that. However, there are lots of statistics on the number of mobile users vs desktop users when it comes to the traffic in general. This trend has been clearly visible for about 15 years now.
Here’s something I found on a short notice. link