The Bluebirds beat Blackburn Rovers 3-0 this afternoon to take one step closer to securing automatic promotion into the Premier League.
Cardiff have now been at the summit of the table for a number of months, and MacKay believes that his side have shown great character and mental strength to remain top for such a long time.
"I'm absolutely delighted with the position we're in and this win gives us that little gap with seven games to go," said MacKay.
"I've a group who have been up there for four months to be analysed, criticised, shot at, ignored and studied, but we have stayed in the top position. We have shown a great character and mentality within our team.
"We are fighting every inch to make sure we give our supporters the dream they want. The performance and result was very pleasing. We started really well and we were relentless. We looked like a team that dominated from start to finish. That doesn't happen too many weeks in this division."
Cardiff's next match comes against third-placed Watford on Saturday.