The bots on this site http://www.steembottracker.com/, vote when the timer expires, however because the can only vote once every 3 seconds, it can take them a few minutes to get to everyone's post.
Randowhale, which is great when its awake, will vote almost instantly when you send it money. However, Randowhale is sleeping most of the time and will just send your money back in that case. You can check its status here: https://steemit.com/@randowhale.
Thanks
Minnowbooster is good option too but only if you find the right amount to bid via it's website
Upvotewhale is instant too but drops message which I don't like.
Thanks dear and keep it coming 👌