goprocstat
Simply display utime and stime for a given PID every second:
% ./goprocstat -p 47
1557222740 pid: 47 user: 0.110000 system: 0.150000
1557222741 pid: 47 user: 0.110000 system: 0.150000
1557222742 pid: 47 user: 0.110000 system: 0.150000
1557222743 pid: 47 user: 0.110000 system: 0.150000
^C
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