With a truly random 8-deck shoe, it shouldn't matter whether the dealer's second card isn't dealt until the players are finished, so I am not concerned if you leave it that way.
Except from a 'provably fair' point of view it would be better if the players (one of who might have admin access to the server and be able to see the deck) had as little influence on the dealer's hand as possible.
Having the dealer deal his hole card before the players act decreases the amount of influence the players have on the dealer's hand.
At the blackjack tables in real casinos you'll often hear "you took the dealer's bust card!" from players who don't understand that I'm just as likely to worsen the dealer's hand than I am to improve it when I play incorrectly. But in this case, where one of the players may be able to see the undealt cards it's more of a concern.