Would 2:18pm today be a good time for the Russians (or Chinese or Iranians or Canadians) to attack the US?

Since there’s going to be the pre-announced text message Presidential alert at 2:18pm Eastern this afternoon, would it be a good time for one of our foreign enemies to be do a sneak attack on the US?

After all, people are being told to essentially ignore the 2:18 text alert, so an attacking country could stealthily attack and people will ignore it.