Has my 'cluster' operation succeeded?

Question

I ran this command:

cluster verbose address using address_locality_lookup;

And got this result:

INFO:  clustering "dba.address" using sequential scan and sort
INFO:  "address": found 0 removable, 29323623 nonremovable row versions in 1139047 pages
DETAIL:  0 dead row versions cannot be removed yet.
CPU 26.00s/8286.70u sec elapsed 8342.01 sec.
CLUSTER
Time: 9366585.421 ms

Does that indicate that clustering succeeded (ie all the rows are now in the order indicated by the address_locality_lookup index)?

What do 'removable', and 'nonremovable' indicate?