I am a Chinese dealer in Shenzhen, have some experience
delivering by Singapore Post. It normally appears during
status change. Such as they pick up the goods but not arrive
distribution center yet .... or the Post man on the way to your
door.
Sometimes I deliver a small pack to Russia by SP (cost is
cheaper than South China), it takes me 20 days.... always
saying "delivery is in progess".. it almost kill me!!