Engine First Start - tranny?

Hi,
My '23 T Bucket project car is almost completed and I am ready to start it and idle it for 20 minutes to properly seat the cam and stuff.
My automatic tranny is still waiting for the speedo sender so there is no fluid in the tranny except for the torque converter.

My question is this:
Can I idle the engine for 20 minutes without any fluid in the tranny?
Thank you for all and any help.

No!! And do not idle to break in the cam, 1800- 2200 rpms.

Sorry. I should have said 'run the engine' not idle. I understand this and varying the rpm from 2000 to 3000 throughout the 20 or so minutes.