Is iPhone 11 pro max duel sim?

Yes. See the following from iPhone 11 Pro - Technical Specifications - Apple

Dual SIM (nano‑SIM and eSIM)12

The only physical dual-SIM iPhones are sold only in Hong Kong, China and Macao.

All other dual SIM iPhones sold everywhere else have one physical SIM slot for a nano-SIM card, and they have a programmable eSIM chipset.