Sort 'top' by CPU time accumulated since launch of top

OS X 10.11.6, GNU bash v3.2.57.

How I want top to behave

top in accumulative mode (counting from launch of top, not boot time), then sort by execution time (for values since launch of top).

Here's what I have at the moment

Unless I misunderstand the man page and misinterpret output,

    top -c a

or equivalently

    top -a

starts accumulating values for all stats set to 0 at launch of top.

I can order output by execution time:

     top -o time

Combining them:

      top -a -o time

however doesn't order by 'time since launch of top', but apparently by 'time since boot'.

Any option to change this?