The phrase "light at the end of the tunnel" is a metaphorical expression that means there is hope or relief in sight, especially after going through difficult times. Full definition
Now, I am finally able to see light at the end of the tunnel with my student loans! (earnest.com)
Debt consolidation is the only light at the end of the tunnel for so many American families. (consolidation.creditcard)
There is always an exciting light at the end of the tunnel when travelling on business — you just have to get through the journey first! (social.hays.com)