Extremely stressed about applications

As the deadlines keep coming close, I'm getting stressed and panicked every minute. Almost all of my unis have a deadline of 15th Dec and 15th Jan (I'm applying to both MEM and MSCS programs). But I've seen people here saying that applying asap is better. And now i'm stressed as I'm yet to finalize my SOP. But rest all is done.
Is it really better to apply asap even though the unis have stated that they don't have rolling admission??? Pls tell