We're out of the woods now as for frost.
The Shefflera probably wouldn't like too many cool days or nights in the low 40's.

Try to set them into afternoon shade as they're likely not acclimated to full sun.

Check your long range forecast - if it says no nights in the low 40's you are probably safe.

As suggested above, while some plants will continue to want light shade, some of your plants can go in full sun. Look them up either with Google or a good houseplant book - or ask on the House Plant Forum. Since the intensity of light from inside to out is a major difference, putting them in light shade will let the plants' leaves adjust to the stronger light gradually. Hardening them off over a couple of days will let you put them in their "final" positions for the summer. Just remember to do the same in the fall, to let them adjust to the lesser light in the indoors. And if you already know all this, my apologies for stating the obvious!

I actually did know to slowly acclimate them to the sun/temps, but no apologies necessary, maybe a lurker that's reading this will find that info helpful!

I'm probably like others here in that I'm just itching to get my outdoor areas "set" with my plantings. Though I certainly don't mind having these plants inside with me too.