As mentioned, there are some metering plugins that can tell you rather quickly if you are close.
The best tool though is your ear. You know how you want the collective work to ebb and flow, build up, etc.
The final CD should be more than a collection of songs at same volume.
Just my opinion.

Knowing where you are at with each one can help shorten the time needed to accomplish the above.
One plugin I like for this is PAR Meter.
It is older but does just fine measuring the sound in a number of ways.
RMS, regular VU Peak, Peak over time avg .. pretty helpful to use in the slot after Ozone to get the settings just right in Ozone before removing PAR Meter and actually rendering. There is lot of volume adjustment available inside Ozone itself.

If I get the RMS around -11 and the Peak average where I want it for a given song (it can vary from being dynamic to 'hot') I know I'm in the ballpark... usually. Sometimes RMS is -13 and even -15 on this particular plugin for a given project but it does seem to help just having the ability to measure in a few different ways that help tell the truth, without letting your eyes fool you by watching VU meters and such. Or your ears working from memory.

Loading all tracks and auditioning is a good way too, as long as All Tracks have the Same Volume settings all the way through the signal path.

You can't load them up and have different track volumes, or some tracks running through AUX and others not .. etc.



I do not work here, but the benefits are still awesome
Make your sound your own!