In that case, shouldn't you reply with "my backlog is currently X weeks/month long, we'll probably get started around Y, I'll keep you updated" instead of sayin

In that case, shouldn't you reply with "my backlog is currently X weeks/month long, we'll probably get started around Y, I'll keep you updated" instead of saying nothing? Since the team wanted to do it and didn't mention that they had to do something before in the meeting, you can assume that they will get started on it right away. If not, at least tell it to the other team so they can explore their options.