This is the current upgrade time for the E-145 for each base on the last bid (19-04). The upgrades from the last bid (19-03) haven't gone to class and won't for the next 1-2 months. 19-04 has an effective date of April 2020.

Most junior Bid 19-04 upgrade :

EWR: 2 yrs, 10 months
CLE: 3 yrs, 6 months.
ORD: 10 yrs, 2 months
IAH: 12 yrs, 6 months
TYS: No upgrades (extremely, extremely senior and tiny base) (6 Lines)

Feel free to update this thread as upgrade time comes down.