Without more details, I'd build a prototype job that looked something like this:

IF EXISTS(SELECT STATUS FROM SOMETABLE WHERE STATUS='READY')

BEGIN

SET XACT_ABORT ON

BEGIN TRAN

EXEC PR_STEP1

EXEC PR_STEP2

EXEC PR_STEP3

UPDATE SOMETABLE SET STATUS='DONE'

COMMIT TRAN

END

ELSE

BEGIN

INSERT INTO TBLOG(MSG,MSGDATE) VALUES ('Status was not ready at this time',getdate())

END