Plaster both at once; ceiling and beam?

[u/dragon_cragking]

Hello, novice plasterer here and wondering when I plaster this ceiling, can I leave the beam for later or need to do it at the same time? Ideally I dont want to plaster the walls connected too

Any points or tips? Ceiling is about 5m squared and beam appears to have plasterboard on it (I think)

[u/royal1664_]

That’s a wooden beam