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Your situation is a unique one, I personally cant advice because I havent been in a similar situation. Perhaps you could just casually ask if he plans to get the group plan anytime soon and see what he says

I agree with @ mrsjyw - I would ask about his future plans generally as to compare against your husbands. I will say, keep in mind for the future that even if your current boss obtains a group plan, it still may be more cost effective to go on your husband's plan even though it is expensive.
My husband and I are paying $600 a month for his health plan (employee + spouse) as opposed to saving $300+ for us each to be on our own (employee only) health plans via our respective jobs. We went this route because his maternity coverage far exceeds mine. So yes, we are paying more per month, but in the long-run we are saving as we aren't having to pay a deductible, and other related costs. To date, given a few early emergency room visits, regular maternity care, lab work, etc, our insurance has been billed over $30,000. We have paid less than $500 out of pocket. If I had stayed with my insurnace via my work, I would have already had to pay quite a bite more out of pocket.

I would also look at the cost of a family plan on your husband to account for the child once he/she is born, once all 3 of you are on the same plan it should be cheaper. You can also ask your boss how much the private plan would be and ask you can use that towards your SO plan and you just pay the difference, it might make the 600 more doable.

You should check on the open enrollment period for your husband's plan. I don't think pregnancy is a qualifying event to add you in a non-enrollment time. This is usually the time of year that the health plan/benefits materials are distributed at companies that offer them.

I agree with what others have said - definitely look into the cost savings that your husband's plan might be able to offer you. My husband and I both can get insurance through our own companies, but we opted to both go on his plan because it was a better plan than mine, although more expensive. It will definitely cover more of my prenatal care when I'm pregnant, which I hope to be next year, so that was the deciding factor for us.