I would gel them to match ambient, since it does save time in post; plus you will retain more color saturation and linearity. But what colors you need could and will vary on many things. Most importantly would be how much of the room is lit with light coming in through the windows vs the room lights?
If the former, you will need more blue in your lights, and that could vary depending on the time of day. It the latter, you will need more Straw and green in your lights.
Also, you kind of have to know if the bulbs are warm tone or cold tone to get an exact match? And sometimes people run out and buy a different kind then what they started with, so there could be a mix. It is hard to know what to bring in terms of gels without scouting and taking color light readings.
My advice, bring as many colors as you can afford to buy and eyeball it on location. Or you could bring one or two generic sets of gels and do the rest in post.