Yes. And I believe will call, however if you order online you can print them unless you get non-printable tickets on stub hub.
Non-printable tickets on StubHub?
You can get tickets from the team up until 2-3 hours before first pitch and from StubHub up to 1-2 hours before game time (I should know this cold considering the number of last minute purchases and sales I've made). Both can be printed at home. Buying from the team you also have the Will Call option.
One note about buying from the team the day of the game is that they release tickets held for the handicapped, VIPs, and the opposing team at around 9-10 AM, so you can get some good seats for mostly sold out games.