Musk didn't say exactly when the test fire footage was taken, but last week he shared a photo of someone standing next to the long-developing engine, which gives a sense of the Raptor's size.
While we were sleeping, SpaceX and Elon Musk were firing a rocket engine that'll one day propel a spaceship to Mars.
There is no substitute for this kind of test-firing and, as Ars Technica notes, "any "first" test firing of a new, full-scale rocket engine that doesn't end in an uncontrolled explosion is a good thing". There'd eventually be 31 Raptors powering the reusable Super Heavy, and seven Raptors on the Starship.
With an initial thrust of 440,000 pounds-force, the Raptor is somewhat less powerful than Blue Origin's BE-4 engine, which also uses methane and liquid oxygen and produces 550,000 pounds-force of thrust. This hopper will debut soon, Musk has said - perhaps within the next month or so, if everything goes according to plan.
The entire hollow nosecone broke off, and at the time, Musk said it would take a few weeks to fix.
Despite Musk being clearly pleased with the "great work" his team have done on this project, SpaceX laid off around 10% of its workforce, or more than 600 employees, in January. The Raptor engine uses a less conventional propellant than the Merlin engine SpaceX developed to power its workhorse Falcon 9 rocket.