A bus should be fine, I would exit the park no later than 10:00 a bit earlier if possible and then go to the AKL bus stop.
To take a taxi, you would just need to walk over the CR, or take the monorail, I prefer to walk. If you decide to take a taxi, I would still leave the MK by 10:00 this will get you to the CR by 10:15.
Since you will have the last seating for Boma I would not want to be late.