No, we actually do not list exactly which file is being processed, but we probably should. See https://bitbucket.org/axantum/axcrypt-net/issues/172/show-file-name-in-progress-bar to follow progress on this issue.
You should be able to tell if it’s done or not – the progressbar should then be cleared. Is it not? You can also cancel from the progress bar by right-clicking it.