Is it tax wise to wait two years to apply for my SS benefit ,while drawing down from my assets?

Generally, yes, but the correct answer depends on conditions such as as your expected longevity and the types of investments you will be using in the interim. A financial planner who knows your entire financial situation is best able to advise you. You can also read numerous articles on the web if you Goggle your question. 

That depends on how long you end up living, and how much extra you will get by delaying claiming your benefit.  There's no right answer.  See a qualified financial planner.