Well, depends on what you are talking about. You might see a bit of rocking day 17/18 because they are positioning themself (head under wing, beak up) and then you may see nothing else until pip because they are resting and getting ready for hatch. You may see rocking before the pip, or may not...
I wouldn't. I'd take out the turner, lay them down and manually turn the three silkies. Make sure you have the humidity up for the ones that are ready to hatch. At the end of the week, when hopefully they are all hatched, I would drop the humidity down and most likely run dry and monitor the air...
That is one heck of a staggerd hatch. So are you adding eggs on a daily basis? How much time is there between the oldest and youngest? If there is only a week difference turning isn't so much an issue as the humidity change at lockdown. I stop turning all my eggs now at the end of day 13. They...