I have noticed a massive drop in throughput on my two main computers over the past day and it turn out to be because everything I’ve processed over the past two days is completed, waiting for validation.

Looking at the server status page shows that there are zero WUs waiting for validation.

Can I assume that my WUs are waiting for a wingman to complete processing before both are passed to the validator?

Yes, this project requires 2 results per workunit for validation.
____________

Yes, this project requires 2 results per workunit for validation.

Looking at the server status page shows that there are zero WUs waiting for validation

The number shown is the number of already received couples of WUs waiting to be validated (bitwise comparison) by the server, this process is very fast so this number is usually around zero.