Mercury stations Rx at 23 degrees Taurus. Ideas will be questioned, and the value of decisions, information, choices and documents will be scrutinized. Can you take that promise/commitment to the bank? Mercury Rx will dig beneath Taurus' assurance, so "what you see is what you get" will be tested.
Nothing will happen quickly, especially since Mars and Pluto are also Rx. This will be a time for slow, steady examination. Going back over what you think you know. This can also be a time of silence. Mercury is quiet in Taurus (words don't come quickly) and when Mercury is Rx, quiet could become mute. You may not get/give an answer until Mercury goes direct.
Remember that Mercury rules the Virgo North Node, so a time out to think/reevaluate will be a crucial part of your North Node path.
Check out this post for a look at Mercury's entire Taurus transit and the significance of Mercury as North Node ruler. Plus, a complete list of all the aspects Mercury Rx and direct will make.