Welcome!
I’d like to be wrong about this but I’d suggest fractional ETFs are unlikely anytime soon. I think I’m right in saying an intermediary provides fractional US shares, so Freetrade would have to build something or find another third party.
This is a bit of a pain as one of the best S&P 500 ETFs has an £800-plus unit price.
We’re may be more likely to get index funds first. OEICs, which are fractional by default, were on FT’s to-do list but it’s gone quiet and we’ve had a change in management so it’s hard to say whether they’re still a priority.
Edit: I hadn’t noticed the above update which is encouraging, especially in light of the fractionals in Isas issue being resolved.