If you play in pc when iOS not available. You'll keep your progress. Only the iOS stopped functioning with crosssave enabled. PC login is functioning properly at least for me. It has same server, same account. Only the iOS client is turned off.
Related to this topic-
You can still access your warframe companion app in a cross platform enabled iOS account.
The game timer is still ongoing. The foundry is running, you can use the distillers or make something in foundry.