when rebalance completed when est_works is zero

I add 12 1TB new disk to ASM using asmca,

then this proses if we check using query below, display est_works is zero.

then when rebalance proses is completed?

please help

select INST_ID,OPERATION,STATE,POWER,SOFAR,EST_WORK,EST_RATE,EST_MINUTES from GV$ASM_OPERATION where GROUP_NUMBER=1;

  INST_ID OPERA STAT   POWER   SOFAR  EST_WORK  EST_RATE EST_MINUTES

---------- ----- ---- ---------- ---------- ---------- ---------- -----------

     1 REBAL WAIT     1

     1 REBAL WAIT     1

     1 REBAL WAIT     1

     1 REBAL WAIT     1

     2 REBAL RUN      1   234337     0    4592      0

     2 REBAL DONE     1  2913868  2913868     0      0

     2 REBAL DONE     1     0     0     0      0

     2 REBAL DONE     1     0     0     0      0

8 rows selected.