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What I want to know is, what can realistically be expected from these mods?
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It's impossible to say, since every vehicle design will respond differently to these mods. And the size of their impact will depend on your vehicle use: high speed drivers would notice a larger % change than predominantly city drivers would (who may see little difference).
I'd start with wheel covers, because they're easiest. Next, given the impending cold weather, do the grille block, because it has multiple advantages, with both aero improvement & engine warm-up / heat retention.
With all 3 mods in place, I'd guesstimate a conservative, reasonable estimate for improvement at moderate (55 mph) highway driving would be in the 4-5% range.