。
By evening, she'll probably have finished her work.
Literal
Evening-by she [topic-は] work [object-を] finish-[resulting-state-ている]-probably-[polite-でしょう].
A compact future-perfect. までには ('by [the time]') stacks the deadline までに with the topic は, fronting the deadline as the question. 終えている ('is in the state of having finished') combines the transitive 終える with resulting-state ~ている. Polite でしょう ('probably') softens the claim to a prediction.