If one runs a Tor relay does that hide to your ISP when you connect?

Tor bridges are supposed to be hidden - their use case is to circumvent bad actors who might blacklist Tor connections

In practice, a dedicated & advanced adversary (i.e. The People’s Republic of China) can map the IPs out. Your small-town local ISP probably can’t

There is an additional factor to consider: analysis of network traffic, not IP, to identify Tor traffic. I cannot speak very intelligently on this, perhaps others can add on