Giants manager Bruce Bochy said Thursday that it's "hard to put a target date" on Barry Zito's return from a sprained right foot, though the left-hander has completed an early phase in his recovery. Zito, who hurt himself on April 16, has shucked his crutches and can walk without wearing his protective boot. Bochy said that once Zito can function without the walking boot, he'll participate in baseball-related activities for one to three weeks before trying to throw off a mound.