At Apple, the project is still progressing with regard to the development of its future browser for Mac. Indeed, it has just posted a new update of Safari Technology Preview. As you probably already know, this is the experimental version of Safari and it is now available in its 14th release. As usual, it is primarily intended for developers so that they can be aware of new features that will arrive soon.
As a reminder, it is possible for everyone to test Safari Technology Preview on their Mac. It does not replace the current Apple browser (Safari) and can work very well at the same time. If you want to take advantage of all its new features, you can already download the 14th version via this link for OS X El Capitan and this one for macOS Sierra. However, anyone who already has the 13th version can update from the Mac App Store.