Waaaaaaaaaaaaaay too early.
I don’t believe it matters. That said, I am also in the camp that it is pointless as it will be worthless for most schools at this point - they’ve caught on. Save the stress and just wait a day and kiddo can keep refreshing the email at the appointed hour.
To put things in perspective, I am told that in the olden days before the magma cooled and while dinosaurs roamed the earth, kids had to wait by a thing called a mailbox until a person dressed in blue walked up at an unspecified date and time with an envelope containing their decisions. 
Patience is a virtue.