That's the connection with the recipients MTA, that message still has to be processed through their spam filter(s) then it gets delivered to their mailbox. FWIW both of my messages to Bro and CC were sent on the :00 second and I still got no love, lol.
The email header on the recipient end will show the real connection time stamps, mx dns to spam engine then to their mta (mail server) and when the message actually landed on their mail server.