It checks the local time and adds offline progress when re-opened.
Thanks for clarifying. When checking task manager I did not see anything running, so I assumed that to be the case. I do not usually play clicker games so I thought the game had to be open to progress. The reason I tried this one out is because I found a demo on new grounds a few years back. By offline progress I assume you mean closed game progress and not that this game has an online mode.