if we take fertilized cell from the chicken egg and remove this fertilized egg cell from the yolk. Transplant this cell into an ostrich egg (carefully place this chicken fertilized egg cell on to ostrich yolk inside the ostrich egg) and incubate this modified ostrich egg. What would happened? Will this chicken embryo start to develop?

In theory I suppose so though it would depend on whether the ostrich egg has the right nutrients to support a chicken embryo's development and how the egg is incubated etc.