Your light schedule is fine, as long as your doing it at the same times everyday and make sure there are NO light leaks. The leaves move more then you think in a day. Yield depends on so many variables no one can really give you a real answer. Ive seen a 1kw hps produce under a pound but also seen over 4. For your first run with a plant you can expect 3/4 to 1.5lbs pretty easy with a 1kw. I would top, chop, clone and train that girl into a much smaller plant, most plants will double in size in the first few weeks of flower some even more. Bigger plants do not mean more yield, and can lead to many issues down the road. Its all in how much light you can get to the plant, to many branches will block light getting to most of the plant meaning you'll get tons of tiny immature buds down low making the extended veg pointless. From the looks of how much you've cut off down low you could have flowered the plant at half maybe a third the height and still had a plant than could use all of your light. Even vertically lit a plant of your size would need 2-3000 watts and a good 10-15ft ceiling to reach its full potential. Right now you have a perfect opportunity to start a sog for your next grow or to gift a bunch of cuts to someone. Its better to start out smaller and simple then you try to grow the biggest craziest plant anyone has ever seen.
