That should do it, yep.
With that many LEDs, I'd recommend "fanning out" the power rather than driving the strand from one end. With 50 LEDs, it's simple enough to just connect both ends to the power supply. When you upgrade later, the last page of the Adalight tutorial
has some advice on powering longer strands.
You might be getting close to the current limit of the Molex connector with 100 LEDs. If there's more than one free connector available, split the strand power across two.