Modern physicalists generally do not argue any more that physicalism is actually monisitc. Here are three references published in the last two decades, that all agree that there are non-physical things in our universe:
What do you mean by non-physical? What fundamentally can that even mean. I suggest it is an incoherent category, or at best a way of grouping and abstracting physical things to compare them, which intrinsically involves physical things.
"A miracle is a violation of the laws of nature; and as a firm and
unalterable experience has established these laws, ...
Information itself is not physical. It is neither matter nor energy.
Information is the configuration (order, shape) of physical matter or energy.
A book is a physical object. The story it contains is information encoded in the shapes and the order of printed characters.
A broadcast radio wave is physical energy. The program you receive is information ...
Genetic information is a product of a mind.
Information is purposeful - it conveys knowledge about or prescribes something meaningful, such as data, function, concept, or process
It is prescriptive - it prescribes biological functions
It prescribes organismal features, such as organs, their arrangement in a body plan, and their relationship to each other