When is the NU EA deadline for recommenders/supplementary materials?

I’m a HS senior applying for NU undergrad. If my teacher delivers her rec sometime between Nov 1 and Nov 15, is that OK?

They’ve got to be in before your deadline or else the common app won’t let you apply. If you’re doing RD you’re fine but EA then you’ve gotta get that handled

But my college counselors said the recommenders don’t have to hand it in as early as the students, e.g. I heard the “supplementary materials deadline” for Cornell is Nov 15 which seems to confirm that, no?