The Artemis II crew is now awake and beginning their launch day activities.

NASA astronaut and mission commander Reid Wiseman, NASA astronaut and pilot Victor Glover, NASA astronaut and mission specialist Christina Koch, and Canadian Space Agency Astronaut and mission specialist Jeremy Hansen will have breakfast and then begin their final preparations for launch day.

-ABC News' Matthew Glasser

Artemis II Launch Director Charlie Blackwell-Thompson has given the "go" for ground teams to begin fueling the SLS rocket, a procedure known as tanking.

Fueling begins with the chilldown step, a critical process that cools the rocket's plumbing and engine systems to super-cold cryogenic temperatures so there aren't any issues when ground teams begin to load the fuel of cryogenic liquid hydrogen and liquid oxygen.

-ABC News' Matthew Glasser

NASA is broadcasting a live feed of the Artemis II moon rocket from the Kennedy Space Center on Merritt Island, Florida.

Teams are activating the ground launch sequencer, the computer that will initiate terminal count -- the final, automated 10 minutes of launch countdown -- which will tell the rocket when to lift off.

Engineers are also initiating the air‑to‑gaseous nitrogen changeover inside the rocket's cavities. NASA says atmospheric air is replaced with inert nitrogen gas, which creates a stable environment before fueling operations.

Watch the live feed here.

The Artemis II moon mission will see four astronauts go on a 685,000-mile, 10-day journey around the moon. Here is what the timeline looks like:

Day 1 is launch day. The astronauts lift off aboard NASA's newest spacecraft, Orion, which will sit atop the Space Launch System rocket. The spacecraft will reach initial orbit and then high-Earth orbit to make a push toward the moon.

Days 2 through 4 are transit days, with the journey to the moon taking three days. Over the course of the journey, the crew will continue to evaluate Orion's systems and practice emergency procedures, in addition to other activities.

On day 5, Orion will enter the lunar sphere of influence, meaning the moon is the main gravitational pull. On day 6, the crew will come its closest to the moon while traveling the farthest from Earth, according NASA.

Days 7 through 10 will see the astronauts make their way back to Earth before re-entering Earth’s atmosphere at high speed, up to 25,000 miles per hour.

The Orion spacecraft will deploy a series of parachutes once through the heat of re-entry to slow down and it will splash down in the Pacific Ocean The U.S. Navy will recover the capsule.

-ABC News’ Mary Kekatos

President Donald Trump called the Artemis II astronauts after the historic lunar flyby on Monday and invited them to the Oval Office upon their return to Earth.

“Today you’ve made history and made all America really proud, incredibly proud,” Trump said. “We have a lot of things to be proud of lately, but this is, there’s nothing like what you’re doing circling around the moon for the first time in more than half a century and breaking the all-time record for the farthest distance from planet Earth.”

After inviting the astronauts to visit the White House, Trump said, "I’ll ask for your autograph ... I don’t really ask for autographs much, but you deserve that."

"I look forward to having you in the Oval Office at the White House, and we will celebrate your incredible achievements and trials," the president said.

The president also said the U.S. will “establish a permanent presence on the moon” one day in the future, as well as “push on to Mars,” though he recognized that the latter feat may not necessarily occur during his administration. 

“We'll plant our flag once again, and this time we won't just leave footprints, we'll establish a permanent presence on the moon, and we'll push on to Mars, that'll be very exciting. I'm waiting for that so much. I'd love to be here, but maybe we won't quite make it in terms of timing,” Trump said.