We have been running Tomb of Annihilation and I keep wondering why Elminster isn’t in it

Does Port Nyanzaru have any high level clerics that could bring someone back from the dead?

If one was wanting to run Tomb of Annihilation, how could I incorporate and adapt it into the Tal’Dorei setting?

Our fearless crew be settin’ sail from Waterdeep for Port Nyanzaru, how long would the journey take?