PWAs are coming to desktop! If you use Vivaldi (like me), then you too can join the PWA gang.

Update: PWAs are now fully supported and no longer "experimental"; you can skip this first step and go right to the installation.

As of today, you'll need to enable the experimental feature allowing installation by visiting vivaldi://experiments/ and checking the box:

Once that's done, visit the PWA you'd like to install, like Google meet. Right click the tab and in the context menu there should now be an option like "Install Google Meet...". Click it and congratulations! Welcome to the future built of Progressive Web Apps.