With visual shout-outs to those ultra-determined Timeless fans known collectively as Clockblockers, cast and crew of the NBC series tweeted images yesterday from the first full table read of the upcoming finale. The images provide no clues, much less spoilers, beyond confirmation that the return is actually happening – and that it will be, in the words of Sony TV co-president Chris Parnell, “exciting, fun and emotion.” The two-part finale will be written by Lauren Greer…