Is my New Jersey Tea doing okay?

I tried two ways of seed starting new Jersey tea last year. Only ONE seed sprouted, and it did not survive long. This year I found a nursery that sells seedlings, and I bought six and planted them right away.

That was two months ago. They started pretty small, maybe an inch and a half tall. Today... They seem to be about the same size.

However I don't see any pest problems, no wilting, no discoloration. It's just kind of stagnated!

It's a perennial, so I'm hoping it's spending all this year putting out roots and it'll have some more showy growth next year. I can't find much info on growing this uncommon plant that fits some good niches of my guilds.

I'd love any insight into how it's doing and tips for how I can help it out!

That first year of stagnation is pretty normal for New Jersey Tea. They put almost everything into root development before the top growth takes off. I planted a few native shrubs that did the same thing, basically nothing visible for an entire season and then suddenly doubled in size the following spring. The fact that yours look healthy with no yellowing or wilting means they're probably establishing just fine underground. I'd leave them alone and check back next spring.

I have found New Jersey Tea to be variable in when it germinates.  I  do a boiling water bath, then cold stratification or winter sowing.  Out of 20 seeds, I may get two sprouts after a couple of weeks of warm weather.  But when I've dumped out the soil from the "dud" pots and used them for other things, I will find NJ tea seedlings in those pots after a month or two.  
I have also planted out those not very strong looking seedlings, and then seen them come up the next year looking pretty good.
I hope your NJ tea gives you some nice surprises!  But I would suggest marking where you planted 'cause it may not look like much early on