If you take enough soil with the plant, you can do it at any time.

If you lose soil and/or roots (as well you might if the plant is growing in amongst rocks/paving, or if the roots simply go too deep), cut the foliage back a commensurate amount straight away. Once in the pot, the plant should then be able to maintain its water balance while it re-roots/establishes.

Blooming should continue so long as you get a fair amount of root and soil. But do keep the pot in a cool (well, all things relative), shady spot for at least a month, while it gets going again.

Since the foliage will continue to get larger for some while yet this season, I suggest you pot the plants up sooner rather than later. ...Less leaf area for the roots to try to support, and more of this year's root growth still to occur. When you cut off some of the leaves, go for the bigger older ones first - they are most likely to harbour red spider mite (so burn the leaves). Cut off any runners, too (you can chop most of the leaves off those runners and try them as cuttings, if you want).