Airflow is generally ceiling to floor - it does not travel much throughout the cabin. So there's not much chance for viral spread outside of your immediate neighbors. Considering that, I think you would be just as safe in seat 10L as you would in 26L since both are fairly isolated.

As others have mentioned though, you're much more at risk in the airport than you are on the plane. There are unavoidable choke points you will have to go through where you will have dozens of people around you in close proximity. If that seems like an unacceptable risk to you I would hold off on traveling until this delta wave dies down.