Call for frequent Awareness, Folk Ken, and OoH Lore rolls, and unless they roll comically high give them a “You don’t notice anything amiss about her” or “You don’t pick up on any double meanings.” Let there be a sense of many things they simply aren’t aware of. You don’t even have to have anything for the rolls, as long as you have one or two things in your pocket in case they get lucky.
Pick a Player Mage’s best formulaic spell, have one of the senior mages cast it (or something much like it) as a non-fatiguing spontaneous spell. Bonus points if that mage isn’t even showing off or trying to make a point - the player mage’s specialties are simply that far below their attention.
If possible, introduce someone who can do something impressive, or who has some sort of clout that the player mages will respect. Once they’re suitably wow’d, introduce someone who is a proportionally bigger fish to THAT character, so the players become aware of the food chain and how far down they are on it.
A mage is complaining about the rude manners of some famous artist/noble/scholar they knew - a simple roll reveals that the person they’re talking about died over 100 years ago. By the same token, perhaps a servant mentions that one of the mages hired his great-grandmother, and the family’s been with the Covenant ever since. Anything to contextualize the sheer Time Abyss of the senior mages as more than just a big number.
If the players voice a concern/problem they’re having, a senior mage asks why they don’t just summon an Aspect of Brighd to have her do it, or ‘turn the mountain into smoke for a few days while you sort it out’ or some other ludicrously mighty feat. The mage isn’t being callous or sarcastic, that’s just the scale he works at and he’s forgotten what it’s like to be freshly gauntleted.
If you know enough about the players’ lofty ideas, perhaps have one of the mages, on hearing about it, launch into a (pre-prepared by you, but off-the-cuff for the NPC) speech exploring all the potential ramifications for the Order, the kingdom, peasant attitudes about birds, the implications for the Church, how it will affect the crops in years to come, etc - the goal isn’t to stymie the players from their goal, but to suggest that there are people who can, without being overwhelmed, keep straight in their heads all the different moving pieces that the player hasn’t thought about.
If interests align, perhaps one of the local mages invites one or more of the players up to their sanctum, or some other space, to ask their opinion on some mystical object or obscure writing they’ve got - the goal here is to show off a fully tricked out, Refinement 5 Lab. (This can also just be a fun way to set some characters on a mystery, or let them succeed and thus make a friend.)