Is this test date to late for early decision?

I’m taking two SAT subject tests in October-- will that be too late for applying ED to Brown?

I saw on College Board site that test results for SAT will be available after only 2 weeks beginning in October. I would think this would apply to subject tests as well and that should be plenty of time.

You should look at the school website.
https://www.brown.edu/admission/undergraduate/apply/first-year-applicants