Possible Clues:

• In position
• Ready, Togo?
• Everybody ready, like moulded jelly
• 'Everything's cool'
• The concrete is wholly hardened already, by the sound of it
• Everything ready to go - like cool jelly?
• Informally ready, as jelly may be
• Ready to begin, like hardened jelly?
• 'I'm ready'
• Ready to go!