Short answer: Currently not. More from the IBM Technote follows.
Is Java 9 Supported on IBM Notes 64-bit Client for Mac?
There currently are no plans to support Java 9 yet.
Note: After upgrading to JDK 9.0.1, the Notes 9.0.1 (64-bit) on Mac will fail to launch. This is a known issue documented under SPR HPXGATDA7Z and APAR LO93406. Customers experiencing this issue may open a PMR with IBM Technical Support and subscribe to this APAR.