Toolbar PR is as useless as threads about PR. Don't waste your time and focus on something important.
I don't think website's keyword performance will be based on the website PR. Except link building (which is now dead almost) no one focus on Website PR.
I said no one can tell definately when does the PR update happens. No official words from Google, that they update PRs everyday.
Yes there is!! They went to continuous updates of PR and factoring of that into the search results years ago!