Hi,
Not sure if you checked already but have you looked on the openreach
Availability checker which may give you some information if not it is possible to get in touch with Openreach and ask them for timescales, I know i was given some however that was by the CEO directly so is a whole other story, I would give them a try if the normal form response team dont help you could try contacting the senior team as they can often help.
Hope that helps in some way, I know myself that being in limbo is expensive. I would tell you though that if there is no fibre optic cable on the poles there's a chance its a long way away as they always but those "egg boxes" so you know called CBT's up there way before they even run fibre.
If i were you i would check what your Mobile phone signal is like on different operators and if you can get a decent speed try a one month contract on a low plan taking a look on USwitch for the best deals and if the speeds are good then you could in theory run of that to lower costs however that's your choice and no one i would take lightly.
I can tell you I have two phone masts 4G near me and I have had to rule that out as 40 Gigs a day over that is going to be a struggle, so you have to consider your usage. It might be worth looking at one month contracts on FTTC then moving however you want to check those costings, I know if i were you i would either move to talktalk, ZEN or BT even if customer service is not good with two of those as I compared the prices and the gigabit option on BT works out at the lowest price however if you want half of that BT and ZEN will cost more than TalkTalk.
My main concern for you is the upgradability as i heard of some talktalk customers being unable or struggling with upgrading as talktalk did not really want to change them over. I cannot comment about recent times as i simply don't know however I would consider your costs as chances are at that stage you have months as usually the installation date is a month away from the date you can order so it really is a long time which can raise the bill.
I know FTTP is coming to me by september 2022 and i don't know if i should renew with virgin media or if i should leave and join FTTC or even a 4G or 5G if available unlimited plan temporally so it really is a decision you should not take lightly as it can cost hundreds extra to keep out of contract but you should know that the possibilities of the fibre arriving could be days to months it really depends.
I just felt like saying that so you knew what you were going to go through, I know I can't wait to leave cable its been the worst experience i have ever had ,my previous FTTP experience was brilliant and was with Orange Fibre networks so the possibilities are there and they are brilliant so don't look back that's one thing i will say.
Let me know if you want any details and i'll be happy to answer.