Sago palm (Cyad revoluta) which are really cyads, not palms - are quite slow growing
, typically taking 8-10 years to grow 1 foot in height grown outdoors in full sun and ideal conditions. In the tropics they grow faster. These plants are usually well over 20 years old before they first produce cones which need to be pollinated to produce seeds
. Pennsylvana is too cold to grow Sagos outside. It is unlikely that Sagos will ever produce seeds
grown indoors where there is little chance of the cones becoming pollinated. Your best chance to propagate a Sago is to hope it eventually produces offsets which will often take years.Indoors it might take years-or never - before they mature enough to propagate. Unlikely the plant will ever produce fertile seeds
indoors so your best chance is propagation through offsets which should only be removed when they grow to at least 6" in diameter.
Not to discourage you, but Sagos are not the ideal indoor plant because of their high light requirements. However, if you decide to get one anyway, I recommend purchasing one already established in at least a 6" pot size. Keep them potbound, let dry out between waterings - the trunk stores water - and place in the brightest window you can.
Hopes this helps somewhat. Good luck!