Apex script for pulling field names from specific page layouts

FieldNamesScript.cls

public String objectName = ''; //example 'Case'
public String layoutName = ''; //example: 'Case Layout'
new LayoutDescriber().run(objectName, layoutName);

// In anonymous Apex, you can define & run a class.
// In this script, using a class ensures all describe methods work, regardless of field-level security (FLS)
public without sharing class LayoutDescriber {

    public void run(String objectName, String layoutName) {
        layoutName = objectName + '-' + layoutName;
        List<String> layoutFieldsCollection = new List<String>();

        List<Metadata.Metadata> layouts = Metadata.Operations.retrieve(Metadata.MetadataType.Layout, new List<String> {layoutName});

        Metadata.Layout layoutMd = (Metadata.Layout)layouts.get(0);

        for (Metadata.LayoutSection section : layoutMd.layoutSections) {
            for (Metadata.LayoutColumn column : section.layoutColumns) {
                if (column.layoutItems != null) {
                    for (Metadata.LayoutItem item : column.layoutItems) {
                        if (item.field != null){    
                        layoutFieldsCollection.add(item.field);
                
                        }
                    }
                }
            }
        }


        for (String s : layoutFieldsCollection){
            if (String.isNotBlank(s)){
                System.debug('Field Label, ' + 
                            Schema.getGlobalDescribe()
                            .get(objectName)
                            .getDescribe()
                            .fields.getMap()
                            .get(s)
                            .getDescribe()
                            .getLabel() 
                            + ',');
            }
        }
    }
}