Parallel foreach async enumeration with maximum degree of parallelism

ForEachAsync.cs

using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace Parallel
{
    public static class EnumerableExtensions
    {
        // Adapted from https://blogs.msdn.microsoft.com/pfxteam/2012/03/05/implementing-a-simple-foreachasync-part-2/
        public static Task ForEachAsync<T>(this IEnumerable<T> source, int degreeOfParallelism, Func<T, Task> body, IProgress<T> progress = null)
        {
            return Task.WhenAll(
                Partitioner.Create(source).GetPartitions(degreeOfParallelism)
                    .Select(partition => Task.Run(async () => {
                        using (partition)
                            while (partition.MoveNext())
                            {
                                await body(partition.Current);
                                progress?.Report(partition.Current);
                            }
                    }))
            );
        }
    }
}

Program.cs

using System;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using Parallel;

class Program
{
    static async Task Main()
    {
        var random = new Random();
        var delays = Enumerable.Range(0, 42).Select(_ => random.Next(0, 100)).ToList();
        IProgress<int> progress = new Progress<int>(i => Console.Write($"{i} "));

        var stopwatch = Stopwatch.StartNew();
        foreach (var i in delays)
        {
            await Task.Delay(i);
            progress.Report(i);
        }
        Console.WriteLine($"{Environment.NewLine}Sequential execution: {stopwatch.Elapsed.TotalSeconds} seconds");
            
        stopwatch.Restart();
        await delays.ForEachAsync(10, async i => await Task.Delay(i), progress);
        Console.WriteLine($"{Environment.NewLine}Parallel execution: {stopwatch.Elapsed.TotalSeconds} seconds");
    }
}

I want to return an Tuple<bool, Ienumerable> from my async how do you incorporate this and collect the result of each task.
bool would be the complex task completed successfully or not, List would be any error messages