Same like you: hooked. I have no idea about the historic correctness of what we see. But that doesn't matter to me. Having said that: we are both 'outsiders' (you USA and I'm from NED). Perhaps GBR viewers have a different idea about the (in)correctness of what is shown.
I've watched S 1-3 during the first lockdown period in March and I was ready for S 4 yesterday evening. Then my wife realised that she hadn't seen S 3. You guessed it: before we can see 4, S 3 has to be run again. Pity, because 4 has Gillian Anderson as Thatcher.