Hi Maureen,
Welcome to the Just You community. I'm so very sorry to hear about the loss of your husband - it can take quite a bit of courage to even think about taking your first solo adventure. Just remember, you aren't alone - the Just You community is a very friendly place and I'm sure our members will make you feel welcome and help you decide on where to take your first trip (whether to the USA or elsewhere), share their experiences and offer any helpful advice.
In terms of The Great Eastern USA - this was a new tour for 2018 and to date there has only been one departure. I did have a quick look at it seems that we haven't had any reviews on the community for this tour yet. The next departure is in a few weeks so I'll keep my fingers crossed that someone posts a message/review on this tour when they return. In the meantime, if you have a particular question regarding the tour, please do not hesitate to ask, I can always speak to the holiday creator to get a response for you.
In terms of weather - May and September are slightly cooler than other dates but still pleasant (but you would still need to make sure you pack a lightweight waterproof jacket in case of a shower).
Kindest regards,
Julia