How can I get final value of $V_{out}$ at $t=∞$ in RC circuit?

I can obtain the transfer function in this RC circuit.

$$ \frac{V_{out}}{V_{in}} = \frac{1}{(RCs+1)} $$

When $V_{in}$ is set to $10V$, how can I get final value of $V_{out}$ at $t=∞$?I tried to use the final value theorem but I can't get the answer.