In my various experiments in first year rooting, I buried a couple leftover cuttings in my front garden. They are starting to grow rather nicely, not large yet but nice strong looking growth is pushing out. Providing cuttings were in good shape when I put them out, I think I currently have a 100% success rate this way.

 
These varieties are likely not going to survive the winter here in ground so I'd like to relocate them to pots as soon as possible so they can establish well.

When would be good to pot them up? I'm trying to balance between them getting decently established so there is less chance of damage and it not getting too late for them to fill in a pot. I'm leaning towards doing it sooner than later.

I would do it now. I can't tell about the amount of sun light they have been receiving but I would put them in filtered  sun
for a few days regardless.

I would disagree with Mike, sorry. Since the leaves started appearing outside, they will have no sun problems, they will enjoy it and will grow better where they are now.
I would wait until the Fall, when the plant is bigger and the roots are stronger, and than pot it up.
I did a similar thing with my leftovers last year and buried them in the most unfavorable spot (very sunny and dry, and it is SoCal). Today, those plants are the healthiest and the largest I have. They had a slow start but that was ok.

If you could just take a shovel or trowel and cut around it the same diameter as the pot, and the right depth, you could scoop up the whole thing and put it in a pot.  Then in the fall or next spring when you up-pot you could replace the soil with mix of your choice.  This would minimize root damage. 

Personally I don't like 1 gallon pots in the sun in the summer.  I try to get my stuff into 2 or 3 gallon pots in the spring and still shade the pots if I can. 

I think you could also be fine if you wait till fall as greenfig suggests.  If you do put it in a pot though, you can put the leaves in sunlight, but be careful about the pot itself.  It should be shaded at least a little.  1 gallon pots can get very hot if they are struck by direct sunlight for an extended duration.  So if you can put it on the north/northeast side of a small bush, or in some other fashion protect the pot from direct sun I think you'll be better off. 

Well, I opted to dig them up. They are extras, so nothing to lose.

I found it interesting that they had very few roots. I intended to move a nice chunk of earth, but with barely any roots I didn't see the point, I just took care not to damage the roots. Plenty of worms squirming today with the drizzle we've had.

Kelby, I have the same thing going on with two unknown varieties. I just put them in shallow trenches and covered with topsoil. They are doing wonderful. I was going to leave them until fall, but because the two groups are two close together I think I will follow  your lead and dig them up now. Keep us posted on how your little transplant does.