LWC.js
getSelectedRec() { var selectedRecords = this.template.querySelector("lightning-datatable").getSelectedRows(); if(selectedRecords.length > 0){ console.log('selectedRecords are ', selectedRecords); let ids = ''; selectedRecords.forEach(currentItem => { ids = ids + ',' + currentItem.Id; }); this.selectedIds = ids.replace(/^,/, ''); this.lstSelectedRecords = selectedRecords; alert(this.selectedIds); } } async handleChange() { let records = this.template.querySelector('lightning-datatable') .getSelectedRows().map( // Converts the Array to desired field updates (record) => ({ ...record, [STATUS_FIELD.Role__c]: 'Actively Prospecting', sobjectType: OBJECT_NAME.Coverage_Team__c }) );
await updateRecords({ records }); }

LWC.html
  <lightning-button   variant="Neutral"
                            label="Selected Records"
                            title="Selected Records"
                            onclick={getSelectedRec} 
                            slot="actions"
                            icon-name="utility:check">
        </lightning-button>
                <lightning-button   variant="Neutral"
                            label="Update Records"
                            title="Update Records"
                            onclick={handleChange} 
                            slot="actions">
                            
        </lightning-button>
        <div style="border-top: 1px solid rgb(221 219 218);">
            <!-- datatable -->
            <lightning-datatable
                    key-field="id"
                    data={data}
                    columns={columns}
                    column-widths-mode="fixed">
            </lightning-datatable>
            <!-- /datatable -->
        </div>

Apex controller:
public with sharing class PA_WBTeam { @AuraEnabled (cacheable=true) public static List<Coverage_Team__c> getTeam(){ return [SELECT Actively_Prospecting_Team__c,Company__c,Contact_Status__c,Employee__c,Id,Location__c,My_Coverage_Team__c,Role__c,Sponsors__c,Status__c,Website__c FROM Coverage_Team__c WHERE Role__c='Suggested by ML Model' AND My_Coverage_Team__c = 'true' ]; }
@AuraEnabled public static void updateRecords(Coverage_Team__c[] records) { update records; } }