ADJ-GRADED (时机)恰当的,适宜的;及时的;适时的 If something happens at an opportune time or is opportune, it happens at the time that is most convenient for someone or most likely to lead to success. (时机)恰当的,适宜的;及时的;适时的 [formal]
I believe that I have arrived at a very opportune moment.