The launch could take place as early as 8:02 p.m. But the action will start hours before this.
If the schedule is similar to previous NASA astronaut flights from SpaceX, then about three and a half hours before launch, the crew will begin donning their custom SpaceX spacesuits. Once technicians confirm that the suits are properly fitted, the four astronauts will say goodbye to their families and be transported to the launch pad.
Approximately two and a half hours before the flight - around 5:30 p.m. EST- the crew will board the Crew Dragon capsule. SpaceX technicians will then perform a number of procedures before sealing them inside the spacecraft, a process that could take about an hour.
Approximately 45 minutes before the scheduled launch time, SpaceX will begin loading the thruster into the rocket and begin performing final checks of the spacecraft's systems and weather to decide if the mission is safe to launch.
Once the rocket is launched, the capsule will begin a series of stages to orbit, including the separation of the first and second stages of the rocket. Within an hour, the spacecraft will fire its thrusters, placing it on the path it will follow until the astronauts return to Earth on Saturday.