Another SignalCheck beta update is rolling out now.. NSA 5G-NR band is now displayed on the main screen, network connection type in dual-SIM configurations will be more reliable (on some devices, the secondary SIM would overwrite the "Connected to" display on the main screen), and other minor bugfixes are included.
Pending any new bugs that pop up over the next few days, this version will roll out as a public release at the end of the week..
That's good news, I just checked the API reference and see the added method. I will certainly add support to SCP, but as you mentioned it all depends on if the phones will support it. My Pixel 7 does not report LTE TA on my T-Mobile eSIM, and only reports inconsistently on my AT&T physical SIM.