postgres - log archive_command execution

we want to have a an entz in the postgres logs upon execution of the archive_command. Someone came up with this archive_command which should achieve this test ! -f /opt/db/backup/postgres/archives/%f && echo $(date "+%F %T.%3N %Z") [$$] ARCH: archiving WAL: %f && cp %p /opt/db/backup/postgres/archives/%f The goal is to have a line telling us which wal file was archived at what time. it throws an error though

2025-08-07 18:06:44.184 CEST    FATAL:  invalid value for parameter "archive_command": "test ! -f /opt/db/backup/postgres/archives/%f && echo $(date "+%F %T.%3N %Z")
[$$] ARCH: archiving WAL: %f && cp %p /opt/db/backup/postgres/archives/%f"
2025-08-07 18:06:44.184 CEST    DETAIL:  String contains unexpected placeholder "%F".

Any idea how to adjust the archive command in order to get this going correctly?