Spawn task on thread after delay and fetch result later

I am trying to execute a function on a different thread after a specified delay. I could use Timer, but I need to fetch the result. As shown below, my solution was to use sleep. I was wondering if this is there are better approaches.

import Base.Threads: @spawn

function run_at(f, delay)
    return f()

f() = sum(rand(10000))

t1 = @spawn run_at(f, 3)