Between 1 and 1000 grams.
Sorry, but at this point there is absolutely no way of knowing.
If you give us the strain, grow details, and training methods (if any), someone with a similar setup who has grown the same strain might tell you how they did, but any answer you get, especially this early in flower will be a guess.
Can't really see the node spacing due to purple lights & the wrong angle. You can get a decent guesstimate that way. Not sure if it's fox-tailing or just not filled in yet. White or natural light helps a lot.