Would be great if we could see at least an estimate of the time needed for it to be completed

As other have said, the results are nearly instant but are about the same as just increasing the window size. Things don't seem clearer, just bigger. Recently, a bug has been introduced where the exports won't play in other applications, so I can no longer watch the videos this produces. An update purports to fix this, but the issue remains. So, for now it's a free/$9.99 window resizer which produces videos you can't watch. For ten dollars I'm not mad. I think there is a lot of potential here and I'm interested in seeing where it goes. That said, I hope the export bug is fixed sooner rather than later because as of now, it's just broken.

The app is really simple to use: simply drop a compatible video file (.mp4, .m4v, .mov) onto the app and it will offer to upscale it proportionately. It is surprisingly quick too (though this is presumably because of the hardware acceleration).The only feedback I have for the developer is that they should add some options or settings that can be adjusted, if at all possible. Well worth the $9.99!

Unsqueeze is a free app that can increase the resolution of your videos. It works for iPhone, iPad, and Mac. With a one-time purchase of $9.99, you can even upscale all the way to 8K for all devices. The app is very simple and easy to use. You simply drop a video you want to upscale, select the final video dimension, and that’s it. The app does the rest for you. I used the app to upscale some of my old videos from 480p to 2K, and the results were impressive.