According to The Hostapedia by Mark Zilis (2009), "...a plant reputed to be a larger version of 'Sitting Pretty' has been dubbed 'Standing Pretty'..."

We have been unable to find any information about 'Standing Pretty' but here is the information we have on 'Sitting Pretty'.

It grows into a small size hosta about 8 inches high and 18 inches wide with dark green foliage that has a yellow medial (center) variegation. The leaves are slightly rippled and mildly corrugated. Its medium purple flowers bloom in July on 12 inch tall scapes followed by viable seeds.

So, we would assume that this cultivar may reach a medium size according to Zilis.