pg_stat_activity.query_start in the future?

I'm buried and not having any good ideas how to diagnose this or what else to
send, so here it is. Feel free to tell me why I'm the one whose confused..

postgres=# SELECT pid, now(), query_start, state, query FROM pg_stat_activity WHERE pid=27757;
pid | now | query_start | state | query
-------+-------------------------------+-------------------------------+--------+-------------------------------------------------------------
27757 | 2018-08-17 11:10:16.568429-04 | 2018-08-17 10:17:52.814282-04 | active | autovacuum: VACUUM ANALYZE public.eric_enodeb_cell_20180815
(1 row)

postgres=# \! ps -O lstart 27757
PID STARTED S TTY TIME COMMAND
27757 Fri Aug 17 08:53:20 2018 S ? 00:11:56 postgres: autovacuum worker process xxxxxton
postgres=# \! date
Fri Aug 17 11:10:58 EDT 2018

Justin