This scroll is discounted because of a minor silk flaw. In this case, it's a lump in the upper silk panel.

Do not take action until the time is right

bù dào huǒ hou bù jiē guō

This literally translates as: Don't take the lid off the pot until the food is done.
Figuratively, this means: Don't take action until the time is right.
You can take this as a call to be patient, or picking just the right time to do something (not too early, not too late).