ahead
/əˈhed; ə`hɛd/ adv
~ (of sb/sth) further forward in space or time （在空间或时间上）向前, 往前, 朝前; 在前
He ran ahead. 他跑在前面.
The way ahead was blocked by fallen trees. 前面的路被倒下的树挡住了.
The time to relax is when we're ahead, eg in advance of our working schedule. 我们提前完成, 才是休息的时候（如提前完成工作计划）.