I apologize in advance.  I do not know how projects are funneled to a teacher for evaluation.  I can tell you that there is an active community on Khan Academy who evaluate projects and there are currently over 11,000 projects in the queue.

If, as a teacher, your student's projects should be funneled to a queue specifically for you to evaluate, you may want to open a ticket with the Service Desk:

https://www.khanacademy.org/computer-programming/spin-off-of-project-fish-tank/6348753019879424

I find the Service Desk very responsive and helpful.

Hi rkoop,

Only the projects that require peer evaluation (What's for Dinner, Ad Design, Fish Tank, Magic 8-Ball, Build-a-House, Make it Rain, Bookshelf) will show up under the "projects that are pending evaluation" filter on the Projects page in your class. The other projects in the course are self-evaluated by the student and will not show up in this list (but they can be viewed under the "All projects" filter).

When a student submits one of these projects for evaluation, the project is placed into a public queue of projects pending evaluation. The project can then be evaluated by you or another member of the community (whoever gets to it first).

All of that aside, I also have some sad news. The peer evaluation system will be disabled on Dec. 1st, 2020, and all projects will shift to using self-evaluations. We're currently changing our entire codebase to a new language, and it unfortunately would be too difficult to keep the evaluation system running during this change. More information on these changes can be found here.

I hope this helps! Please let me know if you have any additional questions!