It is an expression that is used to indicate that something is finished, done, arranged or put to what is required. Example: I change clothes and ready to go.
and ready is incorrectly written and it should be written as "And READY." being its meaning: Final part of a petrified formula of our language. It is a wildcard: serves to put an end to something about what it is: eg. " or take it or leave it; and ready. EEquivale " ended 34.