I would sand green but do your final sand and oil a week or two after that.
:S I've never heard of raising the grain with boiling water?!
You don't need boiling water to raise the grain, any temperature will do and boiling water may crack a spoon if it's not completely dry. If you were to leave a neat tooled finish on the spoon, you won't have to sand it and the grain won't raise either.
Like the spiral, by the way.