Where to find the timing marks?

Both engine options have timing chains and they are not required to be replaced unless there is an issue requiring them to be replaced.

https://www.2carpros.com/articles/serpentine-belt-timing-belt-timing-chain-diagrams

I attached the info below that will help with replacing both since the engine was not mentioned.

Please run through this info and let us know if you have other questions.

Thanks