I upgrade from El Capitain and Notes 9.0.1 IF4 works fine for me. Yesterday IBM launch the FIX5 for Notes on MAC and will support macOS Sierra
Some information from the TN about the fix 5:
IBM Notes 9.0.1 64-bit running 9.0.1 Interim Fix 5 or above supports macOS Sierra and OS X 10.11. IBM clients can open Service Requests running this release.
Full certification of macOS Sierra will be completed by end of October 2016 or approximately 30 days after the general release of macOS Sierra.
IBM Client Application Access (ICAA) 126.96.36.199 Feature Pack 1 due out in November 2016 will support macOS Sierra.