"Opportune time" refers to a specific moment or period that presents a favorable or convenient opportunity to do something or take action. Full definition
The low pressure also brought several Arctic storms, but they did not hit at as opportune times for ice loss, and instead brought a lot of cold air, he said. (scientificamerican.com)
Rosalina plays like a more mobile Zelda, with much lower gravity than the average brawler, making keeping distance between you and your opponents while jumping in at opportune times with ranged attacks an ideal strategy. (snackbar-games.com)
The man who nailed the whole «transition» phase 80 years ago... by saying: «the most opportune time for scoring is immediately after repelling an attack, because opponents are then strung out in the wrong half of the field.» (justarsenal.com)