My timeline:
Applied - 4 May 2021
Conditional Approval - 8 June 2021
(35 days)
I will complete my application using Enrolment on Arrival when I fly to US at the end of June.
For info - I am not a US citizen, Greencard holder or permanent resident, I am a UK citizen and only travel on an ESTA no special Visa.
A much quicker process than I was expecting, especially after I found this forum thread!