The time for one of the greatest Jets of all to say goodbye has come. Curtis Martin will officially announce his retirement within the next two days, The Post has learned. The Jets are expected to make Martin's retirement official with a formal announcement before training camp begins. All players are due to report to Weeb Ewbank Hall on Thursday, with two-a-day practice sessions beginning Friday, meaning the likely day for his ceremonial final run is tomorrow. The time and place for Martin's formal goodbye has yet to be finalized, but it probably will take place in Manhattan.