A more thorough explanation:

QUID ACTUM EST

Quid actum est is a Latin phrase that means "what has been done." It is often used in historical contexts to refer to past events or actions.

• After the battle, the Roman general asked his lieutenant, "Quid actum est?" to find out the outcome.
• When the king returned from his journey, he asked his advisors, "Quid actum est in regno?" to learn about any important developments in the kingdom.

These examples illustrate how quid actum est can be used to inquire about past events or actions. In both cases, someone in a position of authority is asking for a report on what has happened in their absence. The phrase can also be used more generally to ask about any completed task or project.