How much it will yield?

Hey, that looks like its not gonna get too big, maybe like 10 to 20 grams. You could increase the light intensity (if possible) to increase your yield. Based on the distance inbetween the nodes your plant was exposed to a little too weak light. Autoflowers are very hungry for light and you can give them light for 18-22 hours each day. Also try to lower the growlight down as much as possible (without burning your plant tips) . You can probably go down up to 15-20cm above the plant tips with your light.