Yes.
Background, nearly 300 nights QV/QE in QG so have a little experience to draw on.
Prior to Covid, we always went for the large tables. Sometimes it worked so the whole table were happy to dine in the evening at a similar time, sometimes it didn't work as well.
Either way it didn't matter.
We have only ever had one occasion when one couple dined on the dot at 6.30 pm and had almost finished by the time the rest of us appeared and then left the table to the six of us, not even stopping to chat. Their loss.
The food is served when fellow diners want it. ''You'' can wait for the next course if you're joined later or ''you'' can continue at ''your'' own pace. Up to the individuals and the wait staff will accommodate accordingly.
Most people choose a large table, to be sociable and so are fairly willing to compromise on dining time to a certain extent and although there's no fast rule at all, the norm has been a window of around twenty mins in which to turn up, usually 7.30pm to around 7.45pm being a popular time.
As to eating on your own as a couple for lunch or breakfast, that is no problem whatsoever and not in the slightest bit awkward.