Also, MCAS isn't active with flaps extended, so "like during takeoff" isn't correct. MCAS won't be active during takeoff and landing because it's not designed to be active at those times.
Just after takeoff while the plane is still climbing. I'm not sure that helps matters much, as the plane is off the ground and lore's the pilots into a false sense of security as plane's working ok..
Here's the bulletin Boeing issued after the first crash. It's hidden away in the bottom left and not highlighted, so it's easy to miss: "runaway stabilizer". Unfortunately, the brief is more focussed on assuring how safe the planes are, and what counter-measures to take in the event. Rather than what a runaway event looks like. https://theaircurrent.com/aviation-safety/boeing-nearing-737...