Amazing - shiver runs down my spine when I read it. Again, congratulation to the crew.
And it is confirmed: They would have made it to La Guardia. In cases like these, if you make it 2 engines up to this point, you always can make it back if you lost them! Just turn immediatly back to your runway. If you are in doubt, tune your ILS and you see if you are above or below the 3 degrees. All engine out would be about 4-5 degrees depending on your configuration. You might want to have a small margin.
Dani