This is the 2482nd most frequent Korean word.
도착할
"To arrive" (future or descriptive form).
In this sentence, '도착할' is the future tense form of the verb '도착하다', meaning 'to arrive'. It is used to describe a scheduled future action.
기차는 오후 5시에 도착할 예정입니다.
The train is scheduled to arrive at 5 PM.
Here, '도착할 때쯤' combines the future form '도착할' with '때쯤', meaning 'around the time'. It specifies a conditional future occurrence tied to the action of arriving.
우리는 공항에 도착할 때쯤 비가 내리고 있을 것입니다.
It will be raining around the time we arrive at the airport.
In this sentence, '도착할' modifies '소포' to specify the parcel that is set to arrive in the future, functioning as a future participle modifying a noun.