format of process time reports with the time keyword

The time keyword in zsh produces output in the format specified by the variable TIMEFMT.

See the documentation for the TIMEFMT variable in the zshparam manual. e.g. manual of zsh 5.9 (x86_64-apple-darwin22.0)

TIMEFMT
       The format of process time reports with the time keyword.  The default is `%J  %U user %S system %P cpu %*E total'.  Recognizes the following escape sequences, although
       not all may be available on all systems, and some that are available may not be useful:

       %%     A `%'.
       %U     CPU seconds spent in user mode.
       %S     CPU seconds spent in kernel mode.
       %E     Elapsed time in seconds.
       %P     The CPU percentage, computed as 100*(%U+%S)/%E.
       %W     Number of times the process was swapped.
       %X     The average amount in (shared) text space used in kilobytes.
       %D     The average amount in (unshared) data/stack space used in kilobytes.
       %K     The total space used (%X+%D) in kilobytes.
       %M     The  maximum memory the process had in use at any time in kilobytes.
       %F     The number of major page faults (page needed to be brought from disk).
       %R     The number of minor page faults.
       %I     The number of input operations.
       %O     The number of output operations.
       %r     The number of socket messages received.
       %s     The number of socket messages sent.
       %k     The number of signals received.
       %w     Number of voluntary context switches (waits).
       %c     Number of involuntary context switches.
       %J     The name of this job.

       A star may be inserted between the percent sign and flags printing time (e.g., `%*E'); this causes the time to be printed in `hh:mm:ss.ttt' format (hours and minutes are
       only printed if they are not zero).  Alternatively, `m' or `u' may be used (e.g., `%mE') to produce time output in milliseconds or microseconds, respectively.

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