I'm sorry to hear about what's going on for you, especially at a time when so many other horrible things are happening. What a contrast to switch from your previous existence to this one. I'd say, if you can, definitely do probate online.
I'm executor for my mum (after being a OPG deputy for five years) and carried out probate online. My mum's estate was very straightforward. There is 'only' money involved - no property and me and my sister in her will. It's a fairly recent thing to be able to do probate online, and I think they're still refining it, but in my experience it was so convenient. The online forms were simple to understand. There's a link to fill in a form for HMRC as you need that dealt with first to show there's no issues with inheritance tax, etc.
If I remember rightly I received a unique probate registry reference number to send with the original will and, because there were no complicated issues with the estate or HMRC, the online process went ahead. I started the process in January and came back from my [locked-down] holiday [Canaries] this week to find the probate grant waiting for me. I had one email query several weeks ago (about holes indicating a removed paperclip, which I'd removed to photocopy the original will before I posted it off - nothing nefarious about it), and that was the only hitch. The ease of the process was such a relief after all the other admin processes, etc, over the last five years of being a 'deputy'.