Yes, picking grapes or brambles (depending on where the monastery is), or he could be holding a hoe or rake or broom.
Or perhaps he's waving to those unexpected visitors in the longships.
Very versatile figure and I really like the expression on his face.
Love the singing monks, so real I can hear them. I think Eric's monks must be in an Almodovar movie, and I get that... But I hear this:
https://www.youtube.com/watch?v=lN9AJj9rtlk