If you are looking for native Lemmy apps for Windows, I don't know if they exist.
But here is an awesome updated list of webapps available for Lemmy: The Great Big List of Lemmy Apps
You can create a shortcut for them on your desktop. These are fast and minimal and have different styles. There is one webapp in there that is very similar to the old[dot]reddit site.
This will very useful. Right now the only approach I see is to save the post or comment and revisit it after some time, but there are no notifications.
I think sync has a similar feature too, I'm not sure though.