matrix 
This command displays the number of S-pairs yet to be computed in each
degree, if a standard basis of matrix is currently being
constructed. It does not keep track of how many S-pairs have already
been done. Also, it is not always a good indication of how much time a
computation will need, since as S-pairs are done, more S-pairs might
be queued for reduction. Nevertheless, it sometimes gives one an idea
how difficult a computation will be.