Why would they keep it in condition to be able to fight? The more advanced ships of other navies could god forbid, knock a old ship like that out of the water with the newer technologies. Is the USS Missouri in the same condition to where it could be recommissioned fast if it had to?
All four Iowa class ships are decommissioned, but well maintained. They could, if the need arise, be refitted for use... It would take at least a year for the machinery, and I don't know about powder and shell...
With Iowa going to LA, she's the last to finally get a port. New Jersey is in the Delaware River at Camden. Wisconsin is tied up alongside the Nauticus Museum, in Norfolk harbor. Missouri is tied up in Pearl Harbor, adjacent to the Arizona.
When the Wisconsin and Missouri were in action during the Gulf War, they were armed with 32 Tomahawks, 16 Harpoons and four 20 mm Phalanx CIWS mounts. If these were reactivated, Navy preliminary plans in 2010 called for the installation of four RIM-116 Rolling Airframe Missile systems, and two RIM-162 Evolved Sea Sparrow Missile systems. In addition, a radar suite based on that of the Arleigh Burke class DDs was under consideration. That said, it's highly unlikely that any of these ships will ever be recommissioned. If these ships were to come back to service, they would have all of the latest technology, and the ability to shrug off hits that would do serious damage to anything else in the fleet.