Your cameras will allow setting apertures in at least half, possibly 1/3 stops settings.
Even with 'only' 1/2 stop settings, you will never be off more than 2/10 of a stop. Close enough.
So you just round the reading the meter gives to the nearest settable setting, keeping in mind the old thingy that negative film likes overexposure better, slide film underexposure better than the other thing.
And yes, all the digital meters give readings in at least 1/3, most in 1/10 stop steps.
You want metering devices to give accurate readings, after all.
Analog meters do the same, by the way. Their meter needles don't treat the scale as only having full stop positions they can move to, but will happily move to any position in between.