Fleet maintenance uses the Out of Place Patching option with minimum downtime. Also this can be done only via emcli verb and there is no GUI option available.
This post demonstrates how to apply the latest Release Update DB July 2020 Release Update 22.214.171.124.200714 and OJVM July 2020 Release Update 126.96.36.199.200714 onto standalone database.
Primary Host/Database : oemnode1 / OEMREP
Standby Host/Database : stbnode1 / STBOEMREP
Current ORACLE_HOME : /u01/app/oracle/product/19.0.0/dbhome_1
Referenced ORACLE_HOME: /u01/app/oracle/product/19.0.0/dbhome_2
REF_TARGET_NAME : OraDB19Home2_8_oemnode1_8
New Out of Place ORACLE_HOME: /u01/app/oracle/product/19.0.0/dbhome_3
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