Yep. That's normal. The car takes a second or so to boot up after powering up.
If you turn the key to accessory position and pause, it will start immediately upon turning the rest of the way to crank position. That's not necessary. Just a note, and probably what you did without thinking about it on those occasions when it cranked right up without a pause.
You might notice too that if you release a bit too soon, where some cars would then fail to start ... the smart will go ahead and finish starting.
Welcome to the world of smarts and SCoA!