I know everyone says that they have issues with soundbars that are not Sony, but I am very happy with my Vizio M-Series 5.1.2 (M512a-H6). I use it with my X90J 65", and have never ran into any issues. You can also find it on sale a lot, right now it's not the cheapest, but when I picked mine up from Best Buy a few months ago it was only $350.
https://www.amazon.com/dp/B08TV6GJF7/ref=cm_sw_r_sm_apa_glt_fabc_70VH8TT96AEZBE22RQH8
Supposedly shipped today. Full price $320.24
I also chatted in with best buy but they couldn't give me any definitive answers either. The agent said that they had no info from the manufacturer of when it would be available, although in her experience after a product is posted, they see info trickle in mid week. So we'll see.
Amazon also shows this available at a slightly higher price, with an estimated stocking of mid march - april...