At the ready
Definition 1 of 1
Pro Tip 1/3Immediate Readiness
Conveys someone's promptness to act quickly without delay or preparation. 
The medical staff was at the ready as the ambulance arrived.
Pro Tip 2/3Metaphorical Use
Used figuratively to express one's mental preparedness for an upcoming task or challenge. 
She was at the ready for the tough questions in the interview.
Pro Tip 3/3Emergency Situations
Often associated with emergency services or circumstances needing quick response. 
Rescue teams were at the ready as the hurricane approached the coast.