Both Uses

opportune
in
The Remains of the Day
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Nevertheless, I considered most carefully what might be the most opportune occasion to bring the matter up with him; for although I would not for one moment, as I say, suspect Mr Farraday of inconsistency, it nevertheless made sense not to broach the topic when he was preoccupied or distracted.†
Chpt Prol.
I thus thought it opportune to relate at this point, as precisely as possible, what had taken place earlier between myself and Lord Darlington.†
Chpt 3e - *

Definitions:

(1) (opportune)
favorable circumstances for a particular purpose -- especially the circumstance of good timing
(2) (meaning too rare to warrant focus)