I spoke with someone I know with schp and he told me that they were adding 700 mhz to the towers and going phase 2
There are already at least 4 active Palmetto 800 sites in the state that are using 700Mhz sites - in Berkeley County, Fairfield County, Orangeburg County and Lancaster County. I haven't seen any evidence that additional frequencies are being added to existing sites to create a mix of 700MHz and 800MHz frequencies on a given site. It's certainly possible, but doesn't seem likely.
You can search the RadioReference FCC database by FRN. From the main database page, scroll down to the "Search FCC data" section. Plug this number into the FRN search: 0001861103. It's the SC Dept of Administration FRN. Not all Palmetto 800 sites and frequencies are licensed by the SC DOA, but a whole lot of them are. You can sort this list any number of ways, but try sorting by the callsign column (click the word "Callsign" in the top row of the list). Generally, not always, the newest licenses to be issued are the "highest" callsign alphabetically. So if you sort by callsign and go to the last page of the list, in theory you'll see the newest licenses. It appears that the most recent license is for a site using 800MHz frequencies in Chesterfield County, with the license issued in August 2020.
You can also see the most recent 250 FCC license grants per county. Go to a county's database page in the RR database, click on the FCC Licenses tab, and click the link for "Display Latest 250 licenses in XXX County." This list is sorted in chronological order, with the newest licenses listed first. This will show modified/updated licenses, which sorting the FRN list alphabetically won't necessarily show.
Neither of these lists is a sure-fire guaranteed way to know every detail about every site on the system, but it can give an indication of changes or additions to frequencies and sites, usually before changes are made. I would be a little surprised to see a lot of frequencies added to existing sites if the switch to P25 Phase II is near at hand. Phase II TDMA effectively doubles the number of talk paths available to the system - it splits each frequency into two channels. It's a much more effective way to expand capacity.
I suspect that there is still a notable number of non-Phase II-compatible subscribers on the network, which would prevent the system from changing completely to Phase II immediately. But it's possible that the system will run, or is running, in mixed Phase I/Phase II mode for some time until those subscribers are all replaced.
Using a control channel decoding application like DSD+, Unitrunker or Pro96Com can reveal if Phase II is being used, in absence of a scanner that supports and displays Phase II transmissions.