Some other pointers/ corrections /additions to above. (Caveat these are A319 figures but all should be the same).
The MAX decelerations setting commands 6m/^2 deceleration rate but wont actually achieve this as it’s greater than what’s the aircraft can do. (The anti skid on the day will determine deceleration rate)
Low starts after 4 seconds after ground spoiler extension. The rate is 1.7m/s^2
MED after 2 seconds @3m/2^2.
There is an option available now to reduce the time delay on LOW to 2 sec.
none of this is relevant for taxi but it might help you refine your question if you need.