Last year of PhD: only one paper in peer review and other in arxiv. Problem with postdoc?
You should work to improve your record, however you can, but it is what it is, so you have to deal with that. I think, however, that choosing a postdoc purely by counting papers would be pretty foolish. The question should be, and, I hope, usually is, how good a fit is this candidate for this position.
I can't guarantee that everyone is rational, of course, but the nature and significance of your work should weigh heavily. And, a rational system would look at more than what you have already finished. Work in progress is a good thing. A reasonable personality is a good thing. Compatible interests, a circle of contacts (especially collaborators)... All good things.
My suggestion is that in any application, that you don't apologize for how bad you are, as you seem to be doing here. Instead, indicate how your skills match the requirements of the position and your goals looking forward.
It is easy to get a lot of work done, and maybe publications, if you only work on the easier-to-resolve problems. If you work on hard problems (harder than average), then having fewer than average publications is natural. Some questions take a long time to answer. If you are confident in your work, then project that confidence, as well as your compatibility with any position you apply for.