Autofill doesn’t currently work for desktop applications. We do have a feature request for it, and it seems most major OS vendors are working towards enabling password managers to offer this feature in a secure manner in the near future.
Currently you’d need to copy+past (though you can of course use the quick copy buttons) into your standalone app.
There are some that do perform this function, but it’s always good to review their implementation, since it’s acting as a keyboard emulator in some cases.
Specifically, Keepass and Roboform are mentioned for Windows in the feature request thread.
Right now auto-type in some applications is pretty rough. But, for instance MS and Apple are working on frameworks to tie in password managers into the OS more directly so all the data is moving in a safe and known fashion, instead of emulating key inputs, etc.
Welcome, @Steven_Kramer to the community. There are a few feature requests that address this question. After you have browsed around a bit, feel free to go vote for one or both of them.
In short, the desktop app facilities use of biometrics, but it does not yet have native app autofill.