Several well-known golfers in history had a distinct pause at the top of their backswing. Byron Nelson did. Cary Middlecoff did. Among today’s players, Hideki Matsuyama does. There are many others, so there’s nothing wrong with it.
What can pause do for you? Several things.
When you swing the club back, it takes muscular effort to to bring the club to a stop and start it up in the opposite direction. The pause lets your muscles relax after you stop the club, so you can start up again from a relaxed, not tense, state.
It keeps your forward swing from being hurried. We all know that the club should start down at the same speed it came up. A pause lets you do this much more consistently than the rebound into the forward swing you make now.
Do you hit over the top? A pause is a reminder to start swinging the club down so you can hit when it’s time to hit, not before.
When you start the club down from a stop, you let the natural speed-generating forces–gravity and your turn–generate clubhead speed unimpeded by useless physical effort.
Finally, a pause lets you keep rhythm in your swing, which is the glue that holds your swing together.
How long should the pause be? If it fits rhythmically into your swing, and you start hitting one good shot after another, then I guess you figured it out.