Deploying ApexClass metadata from Apex

ApexClassDeployFromApex

    public static MetadataService.DeployOptions getDeployOptions(){
             
        MetadataService.DeployOptions lvDeployOption = new MetadataService.DeployOptions();
        lvDeployOption.allowMissingFiles = false;
        lvDeployOption.autoUpdatePackage = true;
        lvDeployOption.checkOnly = false;
        lvDeployOption.ignoreWarnings = true;
        lvDeployOption.performRetrieve = false;
        lvDeployOption.purgeOnDelete = false;
        lvDeployOption.rollbackOnError = true;
        lvDeployOption.runTests = new String[]{};
        lvDeployOption.singlePackage = true;
        lvDeployOption.testLevel = 'NoTestRun';
           
         
        return lvDeployOption;
        }

        public static String generateZipfile() {
            Zippex sampleZip = new Zippex();
            Blob fileData = Blob.valueOf(getPackageXml());
            sampleZip.addFile('package.xml', fileData, null);
            fileData = Blob.valueOf(getHelloWorldMetadata());
            sampleZip.addFile('classes/HelloWorld.cls-meta.xml', fileData, null);
            fileData = Blob.valueOf(getHelloWorld());
            sampleZip.addFile('classes/HelloWorld.cls', fileData, null);
            return EncodingUtil.base64Encode(sampleZip.getZipArchive());

        }

        public static void deployApexClass() {
            MetadataService.MetadataPort service = new MetadataService.MetadataPort();
            service.SessionHeader = new MetadataService.SessionHeader_element();
            service.SessionHeader.sessionId = UserInfo.getSessionId();
            String zippedClass = generateZipfile();
            MetadataService.AsyncResult deployResult= service.deploy(zippedClass, getDeployOptions());
            String jobId = deployResult.id;
            MetadataService.DeployResult result = service.checkDeployStatus(jobId,true);
            System.debug('deploy status is: ' + result);
            Long startTime = DateTime.now().getTime();
            Long finishTime = DateTime.now().getTime();
            while ((finishTime - startTime) < 3000) {         
                finishTime = DateTime.now().getTime();
            }
            result = service.checkDeployStatus( jobId,true);
            System.debug('deploy status is: ' + result);
        }

        public static String getPackageXml()
        {
            return '<?xml version="1.0" encoding="UTF-8"?>' + 
                '<Package xmlns="http://soap.sforce.com/2006/04/metadata">' + 
                    '<types>' + 
                        '<members>HelloWorld</members>' +
                        '<name>ApexClass</name>' + 
                    '</types>' + 
                    '<version>48.0</version>' + 
                '</Package>';		
        }
    
        public static String getHelloWorldMetadata()
        {
            return '<?xml version="1.0" encoding="UTF-8"?>' +
                '<ApexClass xmlns="http://soap.sforce.com/2006/04/metadata">' +
                    '<apiVersion>48.0</apiVersion>' + 
                    '<status>Active</status>' +
                '</ApexClass>';		
        }

        public static String getHelloWorld()	
        {
            return 'public class HelloWorld' + 
                '{' + 
                    'public static void helloWorld()' +
                    '{' + 
                        'System.debug(\' Hello World\');' +
                    '}' +
                '}';
        }