An entire ram will act as a teaser though for any ewes not naturally cycling when he goes in, so whilst you may get a few tupped that are cycling, if any aren’t, he should bring them into season within a fortnight of being introduced with them. Next year use raddle, it makes life so much easier knowing who to watch and when! On previous years when I haven’t used a teaser and have put the ram in early (mid September) the first fortnight had a few ewes tupped and the second fortnight they really got going. Now I use a teaser and put him in mid September; the rams go straight to work as soon as they go in with the ewes on October 1st.
I would be ready for lambs as if they were served when the ram was introduced on sept 1st, but I expect they may have a quiet fortnight and then kick off a couple of weeks in.
FWIW my teaser ram still thinks he’s the real deal, he will “tup” anything that comes into season when he’s in with them, but he isn’t firing anything.