There is no timeline for witness votes. Vote when you like.
If you want to search for a specific tag under the 'New' tab, use the following format.
https://steemit.com/created/ians where ians is the tag I use for my introduce a new steemian posts. Do the same for trending https://steemit.com/trending/ians and https://steemit.com/hot/ians
Thank you my friend.