You definitely want it in before the car arrives. The difference in cost between public and home charging is huge.
If you’re lucky install can take a few weeks to get organised and done, if you’re less lucky it may take months. Then there’s that trick where Ohme decide they can’t install it or it’s a non-standard installation. Either way, I’d want to know before putting my pin in.
I’d get it started now, it hurts nobody just sat there and, if there’s any issues you have time to get them sorted without any time pressure.
I'm Autistic, if I say something you find offensive, please let me know, I can guarantee it was unintentional.
I'll try to give my honest opinion but am always open to learning.
Mark