Approval workflow via parallel AND branches

Hi,

I'm building a workflow where the continuation of the flow requires parallel approval from two user groups.

I have created a two branch AND split, and the flow should continue down, only if both branches go through the "approve" step.

When one branch "approval" step is completed, I need to check whether the other branche's "approval" step has already been completed,

and only then advance to the next step down the flow.

Can someone please advise on how to best perform this check in API code?

Thank you!