Hi Colleen, if you're referring to corporate pension funds in the US, then these are in slightly better shape than public pension funds with 86% funding. Here is a recent article:
https://www.ai-cio.com/news/investment-gains-lift-us-corporate-pension-…

In case you meant how well private US citizens are prepared for retirement, then this is a more much complex topic. For example, the median savings seem to be low (median $17,000 for 56-61 years old), but there is also home ownership and pension income. Overall, US citizens don't seem well prepared. Here are some statistics.
https://www.american-equity.com/resources/blog/a-closer-look-at-the-ave…
Best regards, Nicolas