Yes Space Mtn and Buzz are open too. DL always says the Early Entry rides are subject to change, but the EE rides have been pretty constant since Space Mtn re-opened last year.
Both of these rides have FastPass, but the FP machines are not turned on until the regular park opening occurs.
Unless you have zero desire to do FantasyLand, it is better to not ride Space or Buzz during EE. You can do all of FantasyLand, including Matterhorn during that one hour, and get FastPasses for Space Mtn and Buzz after and hence ride them later in the day with a short line. It does not make sense to use Early Entry time for a ride you can FP later, unless there is just zero desire to do anything in FantasyLand.