Sample Code:

Apex Class: 

public class SampleAuraController {
    
    @AuraEnabled
    public static List < Account > fetchAccts() {
        return [
            SELECT Id, Name, Industry, Is_Active__c
            FROM Account
            LIMIT 10
        ];
    }
    
    @AuraEnabled
    public static void updateAccounts( List < Account > listAccounts ) {
        
        System.debug( 'Accounts are ' + listAccounts );
        update listAccounts;
        
    }

}

Aura Component:

<aura:component implements="force:appHostable" controller="SampleAuraController">
    <aura:attribute type="Account[]" name="acctList"/>    
    <aura:handler name="init" value="{!this}" action="{!c.fetchAccounts}"/>    
    <lightning:card>
        <table class="slds-table slds-table_bordered slds-table_cell-buffer">
            <thead>
                <tr class="slds-text-title_caps">
                    <th scope="col">
                        <div class="slds-truncate" title="Account Name">Account Name</div>
                    </th>
                    <th scope="col">
                        <div class="slds-truncate" title="Industry">Industry</div>
                    </th>
                    <th scope="col">
                        <div class="slds-truncate" title="Is Active?">Is Active?</div>
                    </th>
                </tr>
            </thead>
            <tbody>
                <aura:iteration items="{!v.acctList}" var="a" indexVar="index">
                    <tr>
                        <td data-label="Account Name">
                            <div class="slds-truncate">{!a.Name}</div>
                        </td>
                        <td data-label="Industry">
                            <div class="slds-truncate">{!a.Industry}</div>
                        </td>
                        <td data-label="Is Active?">
                            <div class="slds-truncate" data-record-id="{!index}">
                                <lightning:input type="toggle" variant="label-hidden" checked="{!a.Is_Active__c}" name="{!a.Is_Active__c}" onchange="{! c.onToggleChange }"></lightning:input>
                            </div>
                        </td>
                    </tr>
                </aura:iteration>
            </tbody>
        </table>
        <aura:set attribute="footer">
            <lightning:button variant="brand" label="Save Records" onclick="{! c.saveRecords }"/>
        </aura:set>
    </lightning:card>
</aura:component>

Java Script:

({
    
    fetchAccounts : function( component, event, helper ) {
        
        let action = component.get( "c.fetchAccts" );
        /*action.setParams({
        });*/
        action.setCallback(this, function(response){
            let state = response.getState();
            if ( state === "SUCCESS" ) {
                component.set( "v.acctList", response.getReturnValue() );
            }
        });
        $A.enqueueAction( action );
        
    },
    
    saveRecords : function ( component, event, helper ) {
        
        console.log( "Updated Account values " + JSON.stringify( component.get( "v.acctList" ) ) );        
        let action = component.get( "c.updateAccounts" );
        action.setParams({
            listAccounts : component.get( "v.acctList" )
        });
        action.setCallback(this, function(response){
            let state = response.getState();
            if ( state === "SUCCESS" ) {
                console.log( 'Success' );
            }
        });
        $A.enqueueAction( action );
        
                    
    },
    
    onToggleChange : function ( component, event, helper ) {
        
        let indexVal = event.target.dataset.recordId;
        console.log( "indexVal is " + JSON.stringify( indexVal ) );
        let tempAccList = component.get( "v.acctList" );
        let currentRec = tempAccList[ indexVal ];
        console.log( "Current Value is " + JSON.stringify( currentRec ) );
                    
    }
    
    
})

Note:

Is_Active__c is a check box field in Account object.

Output: