New York (CNN Business) After months of anticipation, SpaceX's new crew-worthy spacecraft, Crew Dragon, is finally prepped for its last major test before astronauts can begin using it for rides to the International Space Station.

But finding the right weather conditions could be a roadblock this weekend.

SpaceX on Saturday delayed a planned launch of its "in-flight abort test", which will demonstrate how Crew Dragon would intentionally eject itself from a malfunctioning rocket on the way to space. But rough waves in the Atlantic Ocean — where Crew Dragon is expected to land after the test flight — prompted SpaceX to delay the test another day.

The company is now aiming to launch Sunday between 8 am and 2 pm ET at Florida's Kennedy Space Center. On Sunday, NASA administrator Jim Bridenstine said the target launch time was 10 AM ET.

Standing down from today's in-flight Crew Dragon launch escape test attempt due to sustained winds and rough seas in the recovery area. Now targeting Sunday, January 19, with a six-hour test window opening at 8:00 a.m. EST, 13:00 UTC — SpaceX (@SpaceX) January 18, 2020

SpaceX has worked for years to prepare for this test. It's expected to be the last major milestone in Crew Dragon's development program before the spacecraft is deemed ready to begin sending astronauts to space.

Read More