They're growing tall fast, overall fast it seems to me
I took a few pics of my plants which are actually about the same age as yours, but stunted when they were tiny because I put them in the system before they were really ready I think. Plus before I had my meter, I'd no idea my ph was super high. (See how the first serated leaves are whacked?)

Theres nothing to really scale them by, but the tub is 10 gallon, and the width of the fattest "fingers" are about 2 inches.

I'm only using old flouro tubes right now, keeping the light literally about 2 millimeters from the leaves. I think thats why they're keeping such tight node spacing and good early branch growth.

ps: my camera is ancient and I'm no photog. I had to photoshop them just to make them look that "good" lmao