With mine they got to about 5-6" within the first year and after 2 years are around 8-9". I would expect full size to take at least another 2 years or so, possibly more.
After 4" (so within a year or so) they start to bulk out. By 6" they tend to be about 2" deep.
I noticed they tend to fatten up a bit, then grow in length and almost fill up their length before growing again (like teenagers growing in height and then fiilling out ). this seems less apparent after the first couple of years once growth slows down.