@snappy Thanks for the compliment, but there are many great people on the forum who help new users. We are fortunate to have those people who are not only very experienced on the machine, but very experienced with recording and engineering in general.
There is a way to pull up a waveform and that is by pressing the jog button. That waveform won't tell you anything useful regarding phase. When you have your snare track up in the mix, and you add the overhead tracks to the mix and it sounds good, you have nothing to worry about. I have never had to reverse the polarity on a set of overhead drum mics.
In my personal experience, it only becomes a problem if microphones are close to being diametrically opposed to each other, such as a snare drum mic facing down on the top and one on the bottom facing up. But that being said, it's not an absolute hard and fast rule. What matters is how it sounds. And I have had occasion to leave the microphones out of phase and it sounded better ("phase" is really an incorrect term in this situation because phase is time based and this is really polarity +/- 180°). Indiscriminately reversing the polarity on microphones can introduce problems at mixdown time. Of course, you can always reverse the polarity on the channel, but unless you've taken really good notes you may not remember which microphones you pressed the magic button on.
FWIW, I never centered my overhead mics on the snare - I centered the overhead mics on the cymbals. But I also had mics on the snare too.
The bottom line is, if it sounds good then it's okay. And to this day, I've never seen the waveforms of any of that stuff I did in the old days on 24 tracks - even my own records. Unless I were to import the mixdown track into a DAW and look at it, I would have no reason to see it. Trust your ears.