It looks like about time. I might water that once more. I wait til the root ball will hold together and the plant drinks all the water in that cup faster than 2-3 days under my T-5 flourescents.
In Ocean Forest my seedlings go a week after the first watering. Then about 4 days then.....
And then I transplant up. Same for my 1 gallon and then into 3 gallon. He plant looks kind of too big for the pot when it's time too.