Moving eggs means they are getting into the right position for hatch time. Exciting! Then they'll go still as they pip internally, then externally, then finally (after quite some time) start unzipping. It is a long process and I think ducks can take ages between the pipping and the unzipping stages, but they are working hard absorbing the remains of the yolk and the blood that's been running through the membrane. It's a very anxious time for us watching and waiting though! I'd say there's still at least 24 hours before you might see external pipping, maybe up to two days even. So breathe and try not to hover over the incubator (don't worry, we all do that)!