Not really.
It just means that:-
after 15 days since application then 7% of the total number of applications submitted have been processed and decided
after 40 days since application then 38% of total number of applications submitted have been processed and decided
after 60 days since application then 90% of total number of applications submitted have been processed and decided
after 90 days since application then 90% of total number of applications submitted have been processed and decided
after 120 days since application then ALL of total number of applications submitted have been processed and decided
Since you have been waiting 7 weeks (say 50 days) then based on UKBA past performace I would expect your decision to be made within a couple of weeks.