What is the current situation for traveling from Bangkok to Savannakhet solo, and are there specific things to know about the border crossing?

I'm sorry if this is old, trodden ground; I tried searching and didn't find anything recent. I was curious about the route from Bangkok to Savannakhet these days, and if there are any caveats about going alone instead of with a group. From what I understand there are Nakhon Chai and Sombat Tour buses from Mor Chit to Mukdahan, and an hourly bus that crosses The Thai-Lao Friendship Bridge 2. Primarily my questions are: during what hours is the bridge open? Is there anything to be aware of, any unexpected or questionable border guard behaviour? I carry a UK passport. I've been on an extension for retirement the past 4 years, off of a Non-Immigrant O that was purchased in Yangon 5 years ago, when I was volunteering with an NGO. I switched to retirement during Covid to avoid having to go out for a new visa. This year, however, I am applying for B visa, having registered and set up a company.

I do know about having to book an appointment, and already have a date booked, but it doesn't coincide with a visa-run van service, so I wanted to check on the latest situation. Also, before Yangon I'd always received visas from Vientiane, so Savannakhet is unknown territory for me.

Thank you in advance.