Here is a link to the SpaceX mission page:
https://www.spacex.com/launches/mission/?missionId=starship-flight-3
Note that several major events are to occur during the flight: re-entry and soft splash down of the booster, testing the payload door, propellant transfer from the header tank, and relight of the raptor engines. Soft splash down attempt of the Starship is also assumed. That's a really aggressive flight test.
Flight Test Timeline
All times are approximate
Hr/Min/Sec Event
00:00:02 Liftoff
00:00:52 Max Q (moment of peak mechanical stress on the rocket)
00:02:42 Booster MECO (most engines cut off)
00:02:44 Hot-staging (Starship Raptor ignition and stage separation)
00:02:55 Booster boostback burn startup
00:03:50 Booster boostback burn shutdown
00:06:36 Booster is transonic
00:06:46 Booster landing burn startup
00:07:04 Booster landing burn shutdown
00:08:35 Starship engine cutoff
00:11:56 Payload door open
00:24:31 Propellant transfer demo
00:40:46 Raptor in-space relight demo
00:49:05 Starship entry
01:02:16 Starship is transonic
01:03:04 Starship is subsonic
01:04:39 An exciting landing!