You can check whether your OTA is active if you have MZD Connected Services enabled on your mobile phone : does it displays your vehicle info? Fuel left, maintenance due etc.
TCM means Tele Communications Module, and CMU is Connectivity Master Unit.
I have the procedure to find out the TCM SW version, however I understand that we cannot include attachments here. If our mod, @willpower, allows it I will do.
You already found out the SW version of the CMU, that is via the 10 inch display.
FYI: all SW is EU-xx-xx-10020 (example), including the UK.