I don’t think there is a standard rate, but you could get higher results by trying different channels and moving both devices.
I have a dap-1522 connected to a dgl-4500 at 5GHz and the speed I get is 216Mbps rate/74% signal. I did spend a good amount of time setting up the locations of both devices to get that as the highest possible connection speed. I could move the dgl-4500 or dap-1522 a few inches and see both numbers drastically drop.