Moving prisoners from one jail to another may happen at any time of day, the inmates are told to get their shit together for transfer but arent generaly told untill they get to dock if its a block transfer or a jail transfer, in as much as when its selected transfer, otherwise they transfer tank by tank (most new jails have what are caled tanks which is a day room, and then then bunk room lined with bunks and a few toilets) to the next prison

that pretty much says it all.