I don't think they will become available till after the claim period ends- and may be not straight away. Will likely have to add the dymension chain in metamask when it happens. I have since seen you can use Leap wallet or Keplr to get a DYM address - but I did the same as you and put my MM address - so I guess we will see when the time comes.
Glad to see others here are eligible. Next one to watch for is SAGA.