Steve has done something I would never even dream of doing because I wouldn't have the mental strength to tackle this challenge. However, the aim is to beat Tommy's record, and I'd assume the new record that Kurt is likely to set. Here is why I think this isn't going to happen, based on some simple calculations.
According to Jo's site Steve on the second attempt has an average speed of 14.5 mph, and the first attempt was ridden at 14.1 mph.
As of 30th Dec. Steve needs 215.6 miles per day to match Tommy's record.
Now if one assumes in a typical day 7½ hours is spent sleeping, 45 minutes is spent in the morning getting ready (showering, eating breakfast etc.) 45 minutes is spent in the evening eating dinner, uploading gpx files to Strava etc. & 45 minutes per day is spent not moving because of traffic lights, buying food, toilet stops etc. then this means Steve can cycle for 14¼ hours per day.
215.6 miles in 14¼ hours is an average speed of 15.1 mph. That's 0.6 mph faster than he's moving at the moment. That doesn't sound like much, but it means Steve finishes ~1,900 miles behind Tommy's record. Close but no cigar.
Now assuming Kurt does 76,000 miles Steve then needs 219.8 miles per day. Using the same assumptions as above results in Steve needing to average 15.4 mph to get beyond 76,000 miles.
Factual conclusion: Steve needs to get faster.
Jo's site also says Steve has spent 55% of the second attempt moving, which means on an average day he's spending 13 hours & 12 minutes cycling, compared to my assumption of 14 hours & 15 minutes. So to ride for 13 hours & 12 minutes per day & still beat Tommy's record he needs to be doing 16.3 mph. To get beyond 76,000 miles he needs to ride at 16.7 mph. Remember, at the moment he's doing 14.5 mph.
Factual conclusion: Steve needs to get a lot faster.
Now, my thoughts. Steve isn't going to increase his average speed by 2.2 miles per hour in order to match 76,000 miles because that's a massive increase, so therefore the attempt at the record is doomed. That isn't me being negative, and it isn't an attack on Steve. It's just my opinion based on some calculations.