I google'd "measure LUFS" and got more hits than I could possibly generate enough interest to explore. Check it out.
PS: props on your using a 2488. I had them ALL - from the initial one through the 'neo - and freekin' LOVED them. I'm now on an O/G DP-32, which is kewl in its' own ways...but DEFINITELY miss some of the great features/capabilities of the '88's that they eliminated in the DP's...
Loudness penalty does not give your track level though - only how much it will be turned down by streaming services. It's worthless information anyway.
Thanks for the precisation @-mjk-, couldn't tell if the OP is interested in web publishing his mix!
I usually take care of peaks not going beyond a certain level and for the rest judge the mix by ears. I'm a sort of pacifist in the Loudness War.